Dreame L40 Ultra · iRobot Roomba Plus 515 Combo

The side-extend mop arm unlocks edge coverage without adding mechanical drag, but it remains a passive extension that cannot navigate around furniture or adjust for novel layouts; mop effectiveness at edges depends on carpet texture and initial arm positioning.

Dock hot-air mop drying reduces manual dry-time while adding dock cycle complexity. Drying cycles add 30-45 minutes to full dock operation; overnight scheduling is practical, on-demand mopping is not.

The dock takes over water, pads and debris for up to three months, but it stands far taller than the 3.29 in robot it serves and needs a fixed spot with power.

Suction is sold only as 3x the Plus 505, a relative claim with no pascal figure on iRobot’s own page.

Homes with high-pile carpet or thick rugs

Mop pads lift when the robot detects carpet, which covers low pile. Thick and shag pile is better excluded with a no-mop zone, and vacuum-only mode covers those rooms.

Owners wanting zero water management

The station refills the robot's tank and its cleaning solution on its own, but the station's 4.5 L clean-water reservoir is filled by hand and the dirty-water tank emptied. A station that plumbs into a water line is the only design that removes that step entirely.

Buyers working to a mid-range budget

List price is $1,499, commonly nearer $1,000 on the street. The extending mop arm and the full-service station are what that buys; a simpler dock covers the same floors with more owner involvement for less money.

Large homes beyond 2,000 square feet per run

iRobot rates coverage at 2,000 sq ft per charge and has not documented recharge-and-resume behavior for larger floor plans on this model.

Deep or high-pile carpet

Pads lift only 10 mm on carpet detection, and no independent carpet test of this model has been published to show how it handles dense pile.

Buyers who want detergent dosed automatically

The dock does not add cleaning solution itself; iRobot directs owners to add a compatible solution to the tank by hand.

Buyers waiting for independent performance testing

Launch coverage from Vacuum Wars and Reviewed contains no test results, so every suction, runtime and coverage figure today is iRobot's own.