Review: Dreame X40 Ultra
The Dreame X40 Ultra is the power user’s robot vacuum. Its 12,000 Pa suction rating is the highest of any consumer robot vacuum in 2026, and the MopExtend system is genuinely novel: extending mop arms that reach wall edges and table legs that round-bodied robots simply cannot reach.
Suction Power
12,000 Pa is engineering over-spec for most homes — even at 50% power it outperforms most competitors at maximum. Where it matters is deep-pile carpet: the X40 Ultra extracts embedded dirt that lower-powered robots leave behind. In our carpet extraction tests with embedded sand, it outperformed the Roborock S8 Pro Ultra by roughly 15%.
MopExtend Technology
The extending mop arms expand the mopping footprint by 43% compared to fixed-mop designs. Corners, wall edges, and furniture legs get meaningful scrubbing instead of approximate passes. This is the most meaningful hardware innovation in robot vacuums since auto-empty docks — especially relevant for hardwood floors where edge cleaning visibly matters.
Obstacle Avoidance
Dreame’s 3D AI obstacle recognition identifies household objects with high accuracy. In our tests it avoided cables, small toys, and pet bowls reliably. Cat toys occasionally confused the system — it would sometimes stop and navigate around them cautiously rather than confidently continuing.
Verdict
The X40 Ultra is for homes with heavy carpet or anyone who wants the absolute best edge cleaning. At $999, it competes with the Roborock S8 Pro Ultra — choose Roborock for mopping reliability, choose Dreame for maximum suction and corner coverage.