Roborock Saros Z70 Review - Are Robot Vacuum Arms a Fad or the Future?

Product Reviewed

Roborock Saros Z70 (robot vacuum-mop combo) — notable for a new OmniGrip mechanical arm that extends to pick up/put away certain detected objects.

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Key Features Mentioned

OmniGrip 5-Axis Mechanical Arm

• Extends from the top when the robot’s front camera detects trained object types.
• In the app, users define:
  • An area for general objects
  • A separate area for slippers
• Can use Roborock’s included container for general objects (optional depending on settings).

Object Detection & Pickup (Trained Categories Only)

• Identifies and grabs items in three categories: clumps, fabrics, and shoes.
• Manual camera mode: can pick up anything under 300 g (per app/manual description).
• Limited slipper/shoe support: appears optimized for certain slipper types (“slides”); other shoes performed poorly.

Custom Training (Limited Scope)

• Roborock states users can train obstacle avoidance for custom objects.
• However, custom recognition does not extend to arm pickup; no plans were mentioned for that.

Mopping System (Major Strength)

• Two spinning mop pads with a 22 mm lift to reduce wetting carpets.
• Can leave pads behind at the dock/base when vacuuming carpets.
• Automatically extends mop pad for improved edge coverage.

Multi-Functional Dock (Major Strength)

• Empties dust into a 2.7 L disposable bag.
• Uses 176°F (80°C) hot water to wash mop pads and self-clean the bin.
• Dries mop pads for hygiene; includes a detergent reservoir (worked well in tests).

Hardware / Design Highlights

• Slim height: 3.14 inches, better under furniture than typical ~4-inch robots.
• Extending side brush for corner coverage (worked well).
• Free-Flow main brush for hard floors and carpets.
• Front wheel lift for thresholds:
  • Up to 40 mm (tiered) or ~30 mm (non-tiered).

Obstacle Avoidance (Major Strength)

• Uses 3D Time-of-Flight (“Star Sight Navigation”) with Verta Beam lateral structured light like the S5 Max.
• Test score: 22/24, described as excellent (slightly lower than S5 Max, likely within margin-of-error).

App Experience (Major Strength)

• Described as one of the best apps in the category.
• Includes many controls/features:
  • Virtual voice assistant
  • Smart Plan 2.0
  • Virtual barriers
  • Pet features, including scheduled/manual “Cruise to Check on Pets” and a video-related pet feature
  • Broad robot + auto-empty controls

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Performance Results and Metrics Mentioned

Mopping Performance

• Dried-on stain mopping test
  • Second-best score: 139
  • 0.7 g left-over water (below average residue → “good”)
• Combined mopping score
  • Labeled “Incredible”
  • Better than S5 Max, and above average versus other vacuum-mop combos tested

Obstacle Avoidance

• 22 out of 24 (excellent; “much higher than average”)

Navigation & Battery (Average)

• Official battery life: 180 minutes (slightly above average)
• Battery efficiency: just above average
• Coverage/charge estimate: above average
• Navigation efficiency and coverage speed/thoroughness: ~exactly average (not great, not terrible)

Suction & Cleaning (Weaker Areas)

• Despite strong official suction specs, measured intake suction was below average; airflow was around average.
• Carpet deep-clean (embedded debris like sand): significantly below average, around 114th place
• Flattened pet-hair pickup on carpet (2.5-inch test): well below average
• Crevice pickup: subpar
• Active hair-removal system: still tangled hair below average

Dust Bin Limitation (Impact)

• Internal bin size: 180 mL (the smallest seen by reviewers)
  • Attributed to space needed for the grabber arm

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OmniGrip Arm: Results (Main Practical Drawback)

• Pickup was hit or miss:
  • Sometimes picked up items; sometimes didn’t
  • Sometimes placed items correctly; sometimes didn’t
• Recognizes only items in Roborock’s trained library.
  • Objects outside that library were not recognized.
• “Forget pre-cleaning” claim largely not supported:
  • Even with clumps, paper, and slides present, it worked only about half the time.
• Overall: useful mostly for early adopters, not most people.

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Comparisons Made

Compared to Roborock S5 Max

• Z70 performed better on mopping.
• Z70’s obstacle avoidance score was slightly lower than S5 Max, but likely testing variance.
• Still underperformed S5 Max in practical cleaning metrics (suction, embedded debris, pet hair, crevices).

Compared to Roborock Edge and S5 Max (Recommendation Alternatives)

• Review states most people will be better served by Roborock Edge or Roborock S5 Max due to similar features at lower price and stronger core performance.

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Pros (As Stated)

• Very strong mopping performance (excellent stain removal and low water residue)
• Excellent obstacle avoidance (22/24)
• Strong, feature-rich app
• High-quality multi-functional dock (hot water wash, drying, detergent reservoir, good auto-cleaning)
• Good physical design fit (slim profile, corner brush, threshold crossing)

Cons (As Stated)

• Mechanical arm pickup is unreliable, limited to a small set of trained items
• “Forget pre-cleaning” claim not reliable
• Below-average practical cleaning:
  • Low measured intake suction
  • Poor deep-cleaning on carpet
  • Weak flattened pet-hair pickup
  • Weak crevice pickup
• Hair still tangles below average despite active hair removal
• Small 180 mL dust bin, likely a tradeoff for the arm

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Overall Ranking / Verdict

• The Z70 Saros is currently #12 on the Vacuum Wars Top 20 list (subject to change).
• Overall recommendation: despite impressive mopping and navigation/obstacle avoidance, the OmniGrip arm is framed as more of a gimmick than a generally helpful tool for most users.
• Who should consider it: early adopters interested in experimenting with object picking.
• Who should skip it (per review): most people should consider Roborock Edge or Roborock S5 Max for better overall cleaning and value.

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Speaker Notes

• Single primary speaker (reviewer) provided both testing and overall judgment.
• No additional viewpoints were clearly attributed to other speakers in the provided subtitles.