Robot Vacuum Buying Guide: Specs That Actually Matter

Robot vacuums look interchangeable on a shelf, but their real-world performance varies enormously. The marketing emphasises suction numbers and 'smart' features while quietly skipping the specs that decide whether it actually cleans your home. This guide translates the spec sheet into what it means for your floors.

Navigation tech: the single biggest decision

• Laser/LiDAR navigation (the little turret on top): builds a map, cleans in straight rows, returns to charge, and resumes. This is the technology that separates ‘actually useful’ from ‘randomly bumps around’.
• Camera-based (vSLAM): also maps, and is thinner for under-furniture clearance, but needs decent light and can struggle in dark rooms.
• Random/bump navigation: cheaper, but it repeatedly covers the same spot and misses others - fine for tiny clear floors, frustrating for real homes.
• Rule of thumb: LiDAR or good camera navigation is the spec to pay for - suction numbers matter far less than how efficiently it covers the floor.

The other specs decoded

• Suction: most robots in the 2,500-5,000Pa range are fine for daily maintenance on hard floors and low-pile carpets. Claims of 'extreme suction' are marketing; the motor’s real-world value is modest once it passes adequate.
• Self-emptying base: the feature that makes the robot actually useful - you empty the base once a month instead of the bin daily. Worth the price bump for most people.
• Mopping: many combos mop with a damp pad - effective for light maintenance, not for deep cleaning. Buy it as a convenience, not a replacement for a proper mop.
• Pet hair: check the brush design for tangle resistance (rubber roller-style brushes beat bristle brushrolls for pet households).
• App features: zones, no-go lines and scheduling matter; 'AI object recognition for cords and socks' is nice-to-have but treat claims with scepticism.

When it is worth the money

A LiDAR robot with good mapping, scheduling and a self-emptying base genuinely earns its price in busy homes with hard floors and daily dirt. For a tiny single-floor flat with almost no floor visible, a cheap random-bump model may be all you need - and for deep carpets, no robot replaces a proper vacuum for the deep clean.