Dreame L40s Ultra vs iRobot Roomba Plus 405 Combo: Which to Buy

The Dreame L40s Ultra is the better robot vacuum overall, rated 4.6 to 3.4. The Dreame L40s Ultra leads on cleaning, mopping and navigation.

Higher rated

Dreame L40s Ultra

#1 in Self-cleaning dock4.6Full review

The value pick of Dreame’s range: strong measured carpet cleaning, long runtime and a full self-cleaning dock for about half the flagship price.

Amazon $499.97

$499.97

iRobot Roomba Plus 405 Combo

#55 in Self-cleaning dock3.4Full review

Suits large, mostly hard-floor homes that want a self-washing mop dock from a familiar brand; weak carpet and pet hair results make it a poor fit for rugs and pets.

Amazon $499.99

$499.99

Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

Choose the Dreame L40s Ultra for cleaning (measured 92% of sand from carpet, 91% of pet hair, no hair tangled vs measured 58% of sand from carpet, 49.5% of pet hair, some hair tangled (0.2)), mopping (Dual spinning pads, leaves its mop at the dock for carpet, extends to edges vs Dual spinning pads) and navigation (LiDAR + 3D light vs LiDAR).

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.

Factor weight	Dreame L40s Ultra	iRobot Roomba Plus 405 Combo
Overall rating	4.6/5	3.4/5
Cleaning 30%	88 measured 92% of sand from carpet, 91% of pet hair, no hair tangled	11 measured 58% of sand from carpet, 49.5% of pet hair, some hair tangled (0.2)
Value 25%	78 $500	78 $500
Dock 20%	100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent	87 Self-empties the bin, washes the mop
Navigation 15%	85 LiDAR + 3D light	65 LiDAR
Mopping 10%	86 Dual spinning pads, leaves its mop at the dock for carpet, extends to edges	56 Dual spinning pads

Independent tests