Roomba Max 705 Combo vs Roborock S8 MaxV Ultra: New Guard vs Old Guard

Cleaning Performance

Here’s an unusual scenario: the newer, cheaper robot has more suction. The Max 705’s 13,000Pa beats the S8 MaxV Ultra’s 10,000Pa by 30%. The S8 MaxV Ultra compensates with optimized airflow and a proven brush design — it scored 96.4% debris removal by weight in lab testing, which suggests the 10,000Pa motor works harder per Pascal than most competitors.

The Max 705’s dual rubber brush rollers are mechanically superior for pet hair. Rubber grips fur, prevents tangling, and maintains performance over time. The S8 MaxV Ultra’s brush system handles hair well but doesn’t match rubber rollers for pure pet fur management.

Both robots handle daily cleaning competently. Neither is a deep-carpet powerhouse at these suction levels, but both manage mixed floors effectively.

Winner: iRobot Roomba Max 705 Combo — 30% more suction and superior rubber rollers for pet hair. The S8 MaxV Ultra’s 96.4% debris removal is impressive, but the Max 705’s higher suction and better brush design give it the edge.

Navigation & Obstacle Avoidance

The S8 MaxV Ultra uses Reactive AI 2.0 with LiDAR, 3D structured light, and an RGB camera. The camera enables video monitoring and pet detection. Its obstacle avoidance is solid, though known to struggle with thin cables and shoelaces — a documented weakness.

The Max 705’s PrecisionVision AI dual cameras recognize 80+ object types. iRobot’s training dataset from millions of homes gives it consistent real-world performance. The system handles cables, pet waste, and wet messes reliably.

The S8 MaxV Ultra at 4.06 inches and Max 705 at 4.1 inches are virtually identical in height. Neither has a meaningful under-furniture advantage.

Winner: Tie — Both have LiDAR + camera navigation. The S8 MaxV adds video monitoring; the Max 705’s avoidance is more reliable with thin objects. Comparable overall.

Mopping

The S8 MaxV Ultra uses VibraRise 3.0 dual vibrating pads at 4,000 scrubs per minute with 20mm auto-lift. The vibrating pads are effective for light to moderate stains, and the 20mm lift is among the highest available, keeping carpet well protected.

The Max 705’s PowerSpin Roller Mop at 200 RPM applies consistent pressure with PerfectEdge extension and a retractable protective cover. The roller mop scrubs more effectively than vibrating pads — it applies rolling contact force rather than oscillating surface pressure.

The retractable cover on the Max 705 is a better carpet-protection solution than even the S8 MaxV’s 20mm mop lift. Physical coverage versus air gap — the cover wins.

Winner: iRobot Roomba Max 705 Combo — The roller mop scrubs more effectively than vibrating pads, and the retractable cover is better carpet protection than 20mm mop lift.

Dock & Maintenance

The S8 MaxV Ultra’s 8-in-1 RockDock Ultra is the more feature-rich station: auto-empty, hot water wash, hot-air dry, auto water refill, auto detergent dispenser, and optional plumbed Refill & Drainage System. The plumbed option eliminates all water management — truly zero-maintenance operation.

The Max 705’s AutoWash Dock handles heated wash, heated dry, 75-day auto-empty, auto water refill, and auto solution dispensing. It’s a full dock but cannot be plumbed.

A practical caveat on that plumbing advantage: it only pays off if the dock can live near a water line and a drain — a laundry room, a utility closet, a kitchen kickspace. If your only realistic dock spot is a hallway or living room wall, the Refill & Drainage System stays a brochure feature, and these two docks end up far closer than the spec sheets suggest.

Battery is close: 150 minutes (Max 705) vs 180 minutes (S8 MaxV Ultra).

Winner: Roborock S8 MaxV Ultra — The optional plumbed dock is unique. Auto detergent plus the option for zero-maintenance water management makes the S8 MaxV’s dock the more capable system for long-term ownership.

Smart Features & App

The S8 MaxV Ultra’s RGB camera enables video monitoring — you can check on pets or your home remotely through the Roborock app. The app itself offers per-room settings, custom sequences, and detailed cleaning reports.

The Max 705’s Matter compatibility enables native Apple Home, Google Home, and Alexa control. For smart home automation, this protocol support is more structurally significant than video monitoring.

Winner: iRobot Roomba Max 705 Combo — Matter support for native smart home integration outweighs video monitoring for most buyers. The S8 MaxV’s camera monitoring is useful but niche.

Value & Price

The “new guard versus old guard” framing has aged since this matchup first landed — the Max 705 is several months into its run now and reads as a known quantity rather than a gamble. The spec math, though, hasn’t moved. At $799 vs $949 (sale price), the Max 705 saves $150. It delivers more suction, better mopping, and Matter support. The S8 MaxV Ultra brings a more established platform, video monitoring, and an optional plumbed dock.

The S8 MaxV Ultra shows its age — 10,000Pa suction and vibrating pads are outpaced by 2025-2026 competitors. At its original $1,799 MSRP, it’s poor value. At the common $899-$949 sale price, it’s competitive but the Max 705 offers a more modern feature set at $150 less.

Winner: iRobot Roomba Max 705 Combo — $150 less with more suction, a better mopping system, and Matter support. The S8 MaxV Ultra’s plumbed dock option is its unique advantage, but the Max 705 is the better overall value.