Introduction
The Dreame L40s Pro Ultra and the Roborock Saros 10R are two 2025 offerings that aim to position themselves amongst the most comprehensive robot vacuum cleaners on the market. Facing them, the Dreame X40 Ultra from 2024 represents the previous generation from the Chinese brand, but remains a solid option for those seeking advanced features without necessarily jumping to the latest models. All three units feature a multifunction base that washes and dries the mops, dual side brushes and extendable mops, placing them in the premium range. The difference lies in the details: suction power, robot height, battery capacity or water temperature during mopping mark significant distances between them.
These models are designed for homes that demand total autonomy and professional results in both vacuuming and mopping. The Roborock Saros 10R stands out particularly for its low profile, whilst the L40s Pro Ultra opts for raw power and the X40 Ultra maintains a balance between both approaches.
Power and Suction
The Dreame L40s Pro Ultra takes the crown in suction power with 19,000 Pa, a figure that slightly surpasses the Roborock Saros 10R (18,500 Pa) and leaves the X40 Ultra, which stays at 12,000 Pa, quite far behind. In practice, this difference can be noticeable on thick carpets or when dealing with heavier debris, although all three models are perfectly capable for homes with pets.
Regarding the main brush, the L40s Pro Ultra features a dual HyperStream brush, designed to prevent hair tangles. The Saros 10R incorporates Roborock's DuoDivide anti-tangle system, which pushes hair towards the central gap for direct suction. The X40 Ultra uses a single brush, also anti-tangle, but without the dual configuration of its bigger sibling. All three raise the main brush during mopping and feature an extendable, liftable and anti-tangle side brush, ensuring effective cleaning in corners and edges without dragging hair throughout the house.
Mopping
All mop with two rotating mops and extend them towards the edges to better cover skirting boards and corners. The Dreame L40s Pro Ultra and the X40 Ultra add the Roboswing system, which allows the robot to make a lateral movement to slightly insert the mop under furniture or overhangs. The Roborock Saros 10R doesn't have this function, although it compensates with superior mop lifting: it can raise them between 12 and 22 mm, whilst the two Dreame models stay at 10.5 mm. This difference can be key if you have thick carpets or mats that you prefer the robot to avoid wetting.
Water temperature marks a notable difference. The Roborock Saros 10R mops with warm water, which helps to better dissolve grease and more stubborn stains. The two Dreame models use cold water. At the base, all wash the mops with hot water and dry them with hot air, ensuring good maintenance and preventing bad odours. The L40s Pro Ultra boasts third-generation tray self-cleaning; the Saros 10R has version 2.0 and the X40 Ultra the second generation. All three detect dirt both on the mops and on the floor, and can automatically re-clean particularly dirty areas.
Navigation System
The Dreame L40s Pro Ultra and the X40 Ultra use LiDAR turret with dual AI camera and front 3D laser sensor. The Roborock Saros 10R employs the StarSight 2.0 system, also with dual camera and 3D sensor. The difference lies in recognition capability: the L40s Pro Ultra identifies up to 180 types of obstacles, the X40 Ultra reaches 120 and the Saros 10R stays at 108. This can translate into more precise navigation in homes with many objects on the floor, although in practice all three offer outstanding performance.
All three recognise pets and feature remote camera access, plus LED for night vision. However, only the two Dreame models detect curtains, a useful detail to avoid tangles. The Roborock Saros 10R incorporates the RR Mason 11.0 algorithm; the X40 Ultra uses Dreame's AI Sage 11.0; for the L40s Pro Ultra the specific algorithm isn't specified in the table.
Autonomy and Battery
The Roborock Saros 10R and the Dreame X40 Ultra share a 6,400 mAh battery, whilst the L40s Pro Ultra has 5,200 mAh. Despite having less capacity, the L40s Pro Ultra offers 220 minutes of autonomy, exceeding the X40 Ultra's 194 and the Saros 10R's 180. This is due to more efficient energy management, something that can be especially noticeable in large homes where the robot needs to complete several cycles without returning to charge.
For spacious homes, the L40s Pro Ultra has the advantage in continuous running time. The Saros 10R compensates with a larger battery which, although offering fewer total minutes, can be useful in intensive cleaning sessions at maximum power.
Smart Functions
All three models overcome simple thresholds, although the X40 Ultra specifies that it can overcome obstacles up to 22 mm. The L40s Pro Ultra and the Roborock Saros 10R feature their own voice assistant, in addition to compatibility with Alexa and Google Home. The X40 Ultra only supports external assistants. None incorporates a robotic arm.
Multifunction Cleaning Base
All three bases auto-empty the dust container, wash and dry the mops with hot water and air, and include a detergent tank. The Dreame L40s Pro Ultra and the X40 Ultra have a 3.2-litre dust bag and water tanks of 4.5 litres (clean) and 4 litres (dirty). The Roborock Saros 10R reduces these figures to 2.5 litres for the bag and 4/3 litres of water. In large homes, the Dreame models require fewer emptyings and refills.
Both the L40s Pro Ultra and the X40 Ultra offer an optional plumbing connection kit, which is purchased separately. The Saros 10R doesn't have this option. None of the three includes integrated plumbing connection or UV disinfection.
Dimensions
The Roborock Saros 10R is the lowest at 79.8 mm in height, allowing it to slip under furniture where the other two cannot reach. The Dreame X40 Ultra measures 97 mm and the L40s Pro Ultra reaches 103.8 mm. The diameter is practically identical: 350 mm for the Dreame models and 353 mm for the Roborock.
As for the base, the Saros 10R is 381 mm wide, 488 mm high and 475 mm deep. The two Dreame models share measurements: 340 mm wide, 590.5 mm high and 456.7 mm deep. The Roborock base is wider but less tall, which may fit better in certain spaces.
Real-world usage experience
The Dreame L40s Pro Ultra is the most comprehensive option for large homes with pets. Its 19,000 Pa power, 220-minute autonomy and ability to recognise 180 obstacles make it an all-rounder. The large base tanks reduce maintenance and the dual HyperStream brush minimises hair tangles. The Roboswing helps to mop under low furniture, although its 103.8 mm height can be a problem if you have sofas or beds very close to the floor.
The Roborock Saros 10R stands out for its ultra-low profile of 79.8 mm, ideal for homes with low furniture. It mops with warm water, which improves results on difficult stains, and lifts the mops up to 22 mm, perfect for thick carpets. The 6,400 mAh battery compensates for the 180 minutes of autonomy in demanding cleaning sessions. The smaller tanks require more frequent maintenance, but Roborock's reliability and the quality of its app are compelling arguments.
The Dreame X40 Ultra is a solid alternative if you're looking for a balance between features and price. With 12,000 Pa it remains powerful, recognises 120 obstacles and features Roboswing for edges. Its 97 mm height allows it to pass under most furniture without problems. The 6,400 mAh battery and large base tanks make it practical for day-to-day use, although the lack of its own voice assistant and lower power place it a step below the 2025 models.
Conclusion: Which one to choose?
Choose the Dreame L40s Pro Ultra if you have a large home with pets and are looking for maximum suction power. Its 220-minute autonomy, ability to recognise 180 obstacles and large tanks make it the most autonomous option. The Roboswing is useful for tricky edges, although you should ensure that its 103.8 mm height isn't a problem under your furniture.
Choose the Roborock Saros 10R if you need a robot that passes under low furniture without problems. Its 79.8 mm height is unbeatable and mopping with warm water makes a difference on difficult stains. The mop lifting of up to 22 mm is perfect if you have thick carpets. The smaller tanks require more attention, but Roborock's reliability compensates.
Choose the Dreame X40 Ultra if you're looking for a balance between advanced features and a more competitive price than the 2025 models. With 12,000 Pa it remains powerful for most homes, features Roboswing and large tanks. Its 97 mm height is a good compromise and the 6,400 mAh battery guarantees sufficient autonomy for medium or large homes without very hairy pets.
