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Robot Autonomy, Classified
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ComparisoniRobot Roomba Max 775 Combo and iRobot Roomba Plus 678 Combo

Up to three

All robot vacuums. Every figure below is placed against the whole class, so a gap can be read against how much the class itself varies.

Where each one suits you.

The conditions each robot was assessed against, side by side. Rows marked in gold are where these machines genuinely differ.

Fit verdicts by condition for each robot
Condition Roomba Max 775 Combo Roomba Plus 678 Combo
Home size
Under 1,500 sqft GoodCapable but overkill for apartment-sized spaces; faster-cycling mop-only units suit compact homes better. GoodRecharge-and-resume and retained LiDAR mapping comfortably cover a compact single-level home in one scheduled run.
1,500 – 3,000 Good30,000Pa suction completes most 2-floor homes in one run; hot-water mop ideal for kitchen and bathroom flooring. GoodSystematic LiDAR mapping and recharge-and-resume are built for this range; typical single-level layouts complete in one scheduled run.
Over 3,000they differ GoodExtended runtime and auto-empty dock handle large homes across multiple rooms; multi-floor mapping navigates complex layouts. DependsIndependent multi-level or large-home coverage testing does not yet exist for this model; recharge-and-resume adds passes rather than eliminating them.
Primary floors
Hard floors GoodHot-spray mop and motorized wash cycle excel on tile, hardwood, and vinyl; no manual water changes required. GoodThe PowerSpin roller and LiDAR navigation are built around hard-floor vacuum-plus-mop runs.
Low / medium pile Good30,000Pa suction and motorized side brush deliver reliable pickup on low-pile and twist carpet; mop compatibility requires no-mop zones. GoodThe roller auto-lifts on low-pile carpet detection; suction performance on carpet is not independently benchmarked.
High pile / shag DependsiRobot flagships document suction loss on shag and high-pile; mop performance on thick carpet may require manual intervention on heavily matted areas. DependsNo independent suction or high-pile test results are documented for this model, and rated suction trails the Max-tier sibling.
Mopping needs
Vacuum only GoodStrong vacuum; the mop lifts or detaches when not needed. GoodStrong vacuum; the mop lifts or detaches when not needed.
Light mopping GoodActive mopping system covers routine floors easily. GoodActive mopping system covers routine floors easily.
Frequent mopping GoodPressure or rotating mop with self-wash is built for frequent mopping. GoodPressure or rotating mop with self-wash is built for frequent mopping.
You want to…
Empty bin myself GoodAuto-empty and hot-water dock reduce daily contact, but weekly water-tank refills, mop-pad swaps, and dock cleaning remain necessary. GoodThe dock automates roller washing and bin emptying, but a hands-on reader can still top off concentrate and run manual clean cycles.
Empty occasionally GoodHot-water dock and motorized wash cycle handle most routine maintenance; weekly checks and monthly consumable swaps keep effort moderate. GoodThe AutoWash dock's self-wash and self-empty cycles handle most routine upkeep between periodic concentrate refills and bag swaps.
Set-and-forgetthey differ PoorHot-water dock and mop-pad washing require weekly intervention; no truly set-and-forget configuration available for combo units. DependsThe dock automates washing and emptying, but the concentrate reservoir and self-empty bag still need periodic manual refills, so it is not fully hands-off.

A robot being poor for a condition is a fact about fit, not a fault. “Depends” means the record names a limit worth reading, not that the answer is unknown.

Keep going.

The full recordiRobot Roomba Max 775 ComboSpecifications, evidence, the Fit Check in full, and every tracked change.The full recordiRobot Roomba Plus 678 ComboSpecifications, evidence, the Fit Check in full, and every tracked change.

Robovations classifies robots; it does not rank them. Nothing on this page is a recommendation, and no manufacturer influences a classification or its placement here.