Introduction
The Dreame L10s Ultra Gen 2 and the Dreame L40s Pro Ultra represent two distinct generations within the Chinese brand's premium range. The former arrived in 2024 as a robust option with a complete multifunction base, whilst the latter landed in 2025 incorporating more advanced technology. Facing them, the Roborock Qrevo Curv S5X from 2024 positions itself as the alternative from the world's leading brand in the sector.
All three models include a multifunction base that washes and dries the mops, something fundamental for achieving truly effective mopping. However, differences in power, navigation and cleaning systems mark quite distinct usage profiles. The Dreame L10s Ultra Gen 2 focuses on autonomy and simplicity, the L40s Pro Ultra incorporates advanced artificial intelligence and premium functions, whilst the Qrevo Curv S5X offers Roborock's characteristic reliability with some very interesting proprietary systems.
Power and Suction
The most evident difference in this robot vacuum comparison is in suction power. The Dreame L40s Pro Ultra delivers 19,000 Pa, a figure that places it amongst the most powerful on the market. The Roborock Qrevo Curv S5X falls slightly below with 18,500 Pa, whilst the Dreame L10s Ultra Gen 2 reaches 10,000 Pa. This difference may seem enormous on paper, but in practice all widely exceed the 8,000 Pa considered sufficient for thick carpets.
The brushing system presents important variations. The Dreame L40s Pro Ultra robot vacuum mounts the HyperStream system with dual anti-tangle brush, designed specifically to prevent hair from wrapping around. The Roborock incorporates its DuoDivide system, also anti-tangle, which pushes hair towards the central suction gap. The L10s Ultra Gen 2 settles for a simple silicone brush that reduces tangles but doesn't eliminate them completely.
The L40s Pro Ultra's side brush is extendable and anti-tangle, as well as raising during mopping. This triple function allows better sweeping of corners, avoiding water marks during mopping and reducing maintenance. The Qrevo Curv S5X also has an extendable and anti-tangle side brush, but it doesn't raise. The L10s Ultra Gen 2 lacks these advanced functions in the side brush. For homes with long-haired pets, these differences prove decisive in day-to-day use.
Mopping
All three units mount a dual rotating mop system, although with different speeds. The Roborock Qrevo Curv S5X rotates at 200 RPM, compared to the 180 RPM of both Dreame models. All three options include mop extension to better reach edges. Both Dreame robot vacuums also incorporate the RoboSwing system, a lateral movement that helps get the mop under overhangs and furniture.
Mop lifting reaches 10.5 mm on the Dreame models and 10 mm on the Roborock, sufficient to climb medium-thickness carpets without wetting them. However, the Dreame L40s Pro Ultra adds a function that makes the difference: it can automatically detach the mops at the base when you only want to vacuum. This avoids having to bend down to remove them manually.
The L40s Pro Ultra and the Qrevo Curv S5X detect dirt both on the mops and on the floor, activating re-scrubbing or re-washing when necessary. The L10s Ultra Gen 2 does not include this intelligent detection, which means it always mops with the same parameters regardless of the dirt level. In practice, this can translate into stains not being completely eliminated or unnecessary passes in already clean areas.
Navigation System
All three robots use 360° LiDAR turret for mapping and basic navigation. All include obstacle avoidance, although with different technologies. The Dreame L10s Ultra Gen 2 and the L40s Pro Ultra mount a front 3D laser sensor, whilst the Roborock Qrevo Curv S5X dispenses with it.
The big difference is made by the Dreame L40s Pro Ultra's dual AI camera, capable of recognising up to 180 different types of obstacles. This camera allows remote access for surveillance, incorporates a front LED for night vision and detects curtains to avoid tangles. Additionally, it recognises stains on the floor to insist on those areas. Neither the L10s Ultra Gen 2 nor the Qrevo Curv S5X offer these advanced visual functions.
Pet recognition is present in both Dreame models, which allows scheduling cleaning when it detects there are no animals in the room. The Roborock does not include this specific function. All three models integrate intelligent cleaning systems: CleanGenius 2.0 in the Dreame models and SmartPlan 2.0 in the Roborock, which adjust power and mopping according to floor type and detected dirt.
Autonomy and Battery
All three robots mount 5,200 mAh batteries, but real autonomy varies considerably. The Dreame L10s Ultra Gen 2 reaches 240 minutes of continuous operation, the L40s Pro Ultra achieves 220 minutes and the Roborock Qrevo Curv S5X remains at 180 minutes. This one-hour difference between the L10s Ultra Gen 2 and the Qrevo Curv S5X can prove relevant in large homes.
The L40s Pro Ultra's lower autonomy despite having the same battery as the L10s Ultra Gen 2 is explained by its greater suction power and the consumption of the AI cameras. The Qrevo Curv S5X, with power similar to the L40s Pro Ultra, consumes the battery more quickly. In any case, all three automatically return to the base when depleted and resume cleaning where they left off.
Intelligent Functions
The ability to overcome obstacles presents significant differences. The best robot vacuum for overcoming steps is the Dreame L40s Pro Ultra, which can climb single steps of 22 mm and double steps of up to 40 mm. This function proves especially useful in homes with different floor levels or transitions between rooms. The L10s Ultra Gen 2 and the Qrevo Curv S5X are limited to 20 mm on single steps.
The proprietary voice assistant is only present in the L40s Pro Ultra, which can respond to voice commands directly without the need for external speakers. All three models are compatible with Alexa and Google Home for control via external assistants.
Multifunction Cleaning Base
All three bases include auto-emptying of the dust bin, washing and drying of mops with hot air at 45°C. However, the mop washing temperature marks an important difference. The Dreame L40s Pro Ultra and the Roborock Qrevo Curv S5X wash the mops with hot water at 75°C, whilst the L10s Ultra Gen 2 uses cold water. Hot water eliminates grease better and disinfects the mops more effectively.
Self-cleaning of the washing tray is present in the L40s Pro Ultra with third-generation technology and in the Qrevo Curv S5X with version 2.0. The L10s Ultra Gen 2 does not include this function, which requires manually cleaning the tray from time to time to avoid accumulation of dirt and bad odours.
Both Dreame robots incorporate a detergent tank in the base that is dispensed during mop washing. The Roborock does not include this option, although it allows adding detergent directly into the clean water tank. Both Dreame models offer 3.2-litre dust bags and water tanks of 4.5 litres for clean water and 4 litres for dirty water. The Qrevo Curv S5X has slightly smaller capacities: 2.5-litre bag, 4 litres of clean water and 3 litres of dirty water.
Both Dreame models allow purchasing an optional kit for direct connection to water pipes, although it must be purchased separately. The Roborock does not offer this possibility even as an accessory.
Dimensions
The Dreame L10s Ultra Gen 2 and the L40s Pro Ultra measure 350 mm in diameter, slightly more compact than the 352 mm of the Roborock Qrevo Curv S5X. In height, the L10s Ultra Gen 2 reaches 97 mm, the Qrevo Curv S5X achieves 98 mm and the L40s Pro Ultra rises to 103.8 mm. This difference of almost 7 mm can determine whether or not the robot passes under certain low furniture.
The Dreame bases are identical: 340 mm wide, 590.5 mm high and 456.7 mm deep. The Roborock base has a more square design of 450 mm in all three dimensions, occupying more floor space but being lower. It's advisable to measure the available space before deciding, especially if you plan to locate the base under furniture or in a cupboard.
Real-world usage experience
For large homes, the Dreame L10s Ultra Gen 2 offers the greatest autonomy with 240 minutes, sufficient to clean up to 300 m² in a single pass. The L40s Pro Ultra covers similar surfaces despite its lower autonomy thanks to its greater cleaning efficiency. The Qrevo Curv S5X, with 180 minutes, adapts better to homes of up to 200 m².
In homes with long-haired pets, the L40s Pro Ultra's dual HyperStream brush and the Qrevo Curv S5X's DuoDivide system drastically reduce maintenance by avoiding tangles. The L10s Ultra Gen 2's simple silicone brush requires more frequent checks. The pet detection of both Dreame models adds convenience by being able to schedule cleaning when animals are not at home.
For those seeking maximum autonomy in mopping without manual intervention, the L40s Pro Ultra stands out for its ability to automatically detach mops, wash with hot water and self-clean the tray. The Qrevo Curv S5X offers similar functions except automatic mop detachment. The L10s Ultra Gen 2 requires more manual attention by washing with cold water and lacking tray self-cleaning.
The L40s Pro Ultra's AI camera navigation provides real advantages in homes with many obstacles or cables on the floor, as well as allowing remote surveillance. The other two models manage adequately with their laser sensors, although they may have more difficulties with dark or very flat objects.
Conclusion: Which to choose?
Choose the Dreame L10s Ultra Gen 2 if you're looking for the best autonomy with 240 minutes of continuous operation, you have a large home and prefer a lower robot that passes under most furniture. Its value for money is excellent for those who don't need the most advanced AI functions and can assume somewhat more manual maintenance at the base.
Choose the Dreame L40s Pro Ultra if you want the best Dreame robot vacuum with 2025 technology, need maximum suction power of 19,000 Pa and value functions such as the dual AI camera, remote access, automatic mop detachment or the ability to climb double steps. It's the ideal option for homes with pets, multiple obstacles and users seeking maximum automation without compromises.
Choose the Roborock Qrevo Curv S5X if you prefer the reliability and ecosystem of the brand
