✨ VS Analyze · VacuumSpain comparison technology. AI-generated explanation based on verified technical data.
Introduction
When we talk about high-end robot vacuum cleaners with multifunctional base stations, three models stand out particularly: the Dreame L40 Ultra AE launched in 2025, the Roborock S8 MaxV Ultra from 2024 and the Dreame X40 Ultra also from 2024. All three devices integrate advanced vacuuming and mopping functions, with laser navigation systems and AI cameras for obstacle recognition.
The Dreame L40 Ultra AE is the most recent, whilst the Roborock S8 MaxV Ultra represents the offering from one of the most established brands in the sector. The Dreame X40 Ultra sits as an intermediate alternative within the Dreame catalogue. All are designed for homes looking to fully automate cleaning, with bases that wash and dry the mops automatically.
Power and Suction
The most notable difference in this robot vacuum cleaner comparison is in suction power. The Dreame L40 Ultra AE offers 19,000 Pa, a figure significantly higher than the 10,000 Pa of the Roborock S8 MaxV Ultra and the 12,000 Pa of the Dreame X40 Ultra. This greater power can make the difference on long-pile carpets or in homes with pets that shed a lot of hair.
Regarding the main brush system, we find two different philosophies. The Roborock robot vacuum cleaner opts for the DuoDivide dual brush, designed to push hairs towards the centre and reduce tangles. The two Dreame models incorporate the TriCut 3.0 system, which combines bristles with blades to cut tangled hairs. All three devices can lift the main brush during mopping.
The side brush marks important differences. The Dreame X40 Ultra is the only one that integrates an extendable, liftable and anti-tangle side brush, a combination that improves cleaning in corners and prevents the brush from touching the mops when mopping. The Roborock S8 MaxV Ultra only features an extendable side brush, whilst the Dreame L40 Ultra AE lacks these functions in the side brush.
Mopping
The mopping system shows relevant differences. The Dreame robot vacuum cleaner in both versions uses two rotating mops with lateral extension through Roboswing movement, which allows the mop to partially reach under furniture and ledges. The Roborock S8 MaxV Ultra mounts a vibrating mop with an extendable mini side mop, a different approach to rotating mops.
Mop lift varies significantly. The Roborock can lift them up to 20 mm, which makes it easier to pass over carpets without wetting them. The two Dreame models reach 10.5 mm of lift, sufficient for medium-thickness carpets but more limited.
All three bases wash the mops with hot water and dry them with hot air, which helps eliminate bacteria and bad odours. All include a detergent tank and dirt detection both on the mops and on the floor. An exclusive function of the Dreame X40 Ultra is the automatic detachment of the mops at the base, allowing the robot to vacuum without dragging the mops when it doesn't need to mop.
Navigation System
All three robots integrate a LiDAR turret for mapping and navigation, complemented with AI cameras and a front 3D laser sensor. The Dreame L40 Ultra AE and the Dreame X40 Ultra incorporate a dual camera, the same as the Roborock S8 MaxV Ultra.
In obstacle recognition, the Dreame models identify up to 120 different types, whilst the Roborock recognises 73. All detect pets and feature LED for night vision and remote camera access. A particular feature of the Dreame X40 Ultra is curtain detection, a function that doesn't appear in the other two models.
The Roborock S8 MaxV Ultra uses the RR Mason 11.0 algorithm and recognises stains through AI for automatic re-mopping. The Dreame X40 Ultra mounts the AI Sage 11.0 processor with CleanGenius functions and also recognises stains. The Dreame L40 Ultra AE includes CleanGenius but doesn't specify a processor or AI stain recognition.
Autonomy and Battery
The Dreame X40 Ultra stands out with a 6,400 mAh battery that provides 194 minutes of autonomy. The Roborock S8 MaxV Ultra and the Dreame L40 Ultra AE mount 5,200 mAh batteries; the former reaches 180 minutes of operation, whilst no autonomy data is available for the latter.
This difference is relevant in large homes. The Dreame X40 Ultra can clean larger surfaces without needing to return to the base to recharge, which reduces the total cleaning time.
Smart Functions
The ability to overcome obstacles is similar: the Dreame X40 Ultra reaches 22 mm, whilst the Dreame L40 Ultra AE and the Roborock S8 MaxV Ultra reach 20 mm. These measurements allow passing over cables, small uneven surfaces or carpet edges without problems.
The Roborock S8 MaxV Ultra incorporates its own voice assistant, a function that the Dreame models don't have. All three robots are compatible with external assistants such as Alexa or Google Home.
Multifunctional Cleaning Base
All three bases perform auto-emptying of the dust bin, washing of mops with hot water, drying with hot air and have a detergent tank. An important difference: the Dreame L40 Ultra AE and the Dreame X40 Ultra include second-generation auto-cleaning of the washing tray, a function absent in the Roborock S8 MaxV Ultra.
The Dreame models offer an optional kit for connection to water pipes, which must be purchased separately. The Roborock doesn't have this option.
In capacities, the two Dreame robot vacuum cleaners have a 3.2-litre dust bag, a 4.5-litre clean water tank and a 4-litre dirty water tank. The Roborock S8 MaxV Ultra has a 2.5-litre bag, a 4-litre clean water tank and a 3.5-litre dirty water tank. In practice, the Dreame models require fewer emptyings and refills.
Dimensions
The Dreame L40 Ultra AE and the Dreame X40 Ultra measure 350 mm in diameter and 97 mm in height. The Roborock S8 MaxV Ultra has 353 mm in diameter and 103 mm in height. Those additional 6 mm in height may limit access under some low furniture.
The bases of the Dreame models are identical: 340 mm wide, 590.5 mm high and 456.7 mm deep. The Roborock base measures 409 mm wide, 470 mm high and 419 mm deep. The Roborock base is wider but less tall, which may influence depending on the available space.
The robot's tanks also vary. The Dreame L40 Ultra AE incorporates a 395 ml dust bin and an 80 ml water tank. The Dreame X40 Ultra has 300 ml for dust and 80 ml for water. The Roborock S8 MaxV Ultra has 270 ml for dust and 100 ml for water.
Real-World Usage Experience
For homes with pets, the Dreame L40 Ultra AE offers advantages due to its 19,000 Pa power and TriCut 3.0 system that cuts hairs. The Dreame X40 Ultra adds an anti-tangle side brush, useful when there's a lot of hair accumulated in corners. The Roborock S8 MaxV Ultra compensates with its DuoDivide dual brush specifically designed to reduce tangles.
In homes with carpets, the mop lift of the Roborock S8 MaxV Ultra (20 mm) is more effective than the 10.5 mm of the Dreame models. If you have thick carpets that you also want to mop, it's worth considering the greater power of the Dreame L40 Ultra AE.
For large houses, the Dreame X40 Ultra stands out for its 6,400 mAh battery and 194 minutes of autonomy, as well as larger tanks in the base that reduce maintenance. The automatic mop detachment function allows vacuuming the entire home without dragging wet mops.
The best robot vacuum cleaner for edge and corner cleaning is the Dreame X40 Ultra, thanks to its extendable and liftable side brush together with the extendable mops with Roboswing. The Roborock S8 MaxV Ultra also extends the side brush, but without the ability to lift it.
Conclusion: Which One to Choose?
Choose the Dreame L40 Ultra AE if you're looking for maximum suction power (19,000 Pa) for long-pile carpets or pets that shed a lot of hair, you value having large tanks in the base (3.2 L dust, 4.5 L clean water) and you prefer a robot with reduced height (97 mm) to pass under low furniture. The second-generation tray auto-cleaning reduces maintenance.
Choose the Roborock S8 MaxV Ultra if you need to lift the mops up to 20 mm due to having thick carpets, you prefer the DuoDivide dual brush system to reduce hair tangles, you value AI stain recognition and its own voice assistant, or you have limited height space for the base (470 mm compared to 590.5 mm for the Dreame models). It's a solid option backed by a very established brand.
Choose the Dreame X40 Ultra if you have a large home that requires maximum autonomy (194 minutes with 6,400 mAh battery), you need thorough corner cleaning thanks to the extendable, liftable and anti-tangle side brush, you value being able to automatically detach the mops at the base to vacuum without mopping, or you're looking for the balance between power (12,000 Pa), advanced functions such as curtain detection and the ability to overcome obstacles up to 22 mm. The AI Sage 11.0 processor with stain recognition completes a very comprehensive device.
