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Robot Autonomy, Classified
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ComparisonEureka J15 Pro Ultra 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 Eureka J15 Pro Ultra Roomba Plus 678 Combo
Home size
Under 1,500 sqft GoodLiDAR coverage is robust but overkill for compact homes; a standard Level III model does the same job for $500+ less. GoodRecharge-and-resume and retained LiDAR mapping comfortably cover a compact single-level home in one scheduled run.
1,500 – 3,000 GoodMulti-room LiDAR mapping shines in 1,500–3,000 sqft homes; scheduled multi-room sequences run unattended. 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 (180 min) covers 4,000+ sqft in a single pass; LiDAR navigates sprawling layouts systematically. 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 GoodSealed hard floors are ideal; IntelliView wet-floor detection prevents mopping damage on wood or tile. GoodThe PowerSpin roller and LiDAR navigation are built around hard-floor vacuum-plus-mop runs.
Low / medium pile GoodSuction rated for low-pile carpet; LiDAR handles transitions between hard and carpet seamlessly. GoodThe roller auto-lifts on low-pile carpet detection; suction performance on carpet is not independently benchmarked.
High pile / shagthey differ PoorOwner reports document suction loss and increased motor load on high-pile and shag carpets; not recommended. 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 GoodDock auto-wash and heated dry assume weekly dock maintenance (water refill, nozzle cleaning); not minimal-touch. 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 GoodSelf-emptying + dock wash fit 'mixed' homes; weekly dock checks replace daily dust bin emptying. GoodThe AutoWash dock's self-wash and self-empty cycles handle most routine upkeep between periodic concentrate refills and bag swaps.
Set-and-forget DependsAuto-empty and self-wash require weekly water refill and monthly nozzle cleaning; not true hands-off. 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 recordEureka J15 Pro UltraSpecifications, 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.