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A robot vacuum is one of the few gadgets that earns its place by being boring: you want it to clean well, dodge trouble, and never need rescuing. Most spec sheets bury those three things under marketing. Here's what to weigh, roughly in order.
1. Navigation beats suction
The single biggest predictor of satisfaction is how the robot sees your home. Lidar (a spinning laser on top) and structured light map rooms accurately and clean in efficient rows. Avoid pure bump-and-turn models unless your home is one small, simple space. Good navigation also unlocks the features people love most: no-go zones, room-by-room cleaning, and the robot actually finishing.
2. Suction, but in context
Suction is measured in pascals (Pa). More is better on carpet, but returns diminish fast. Anything from ~4,000 Pa upward handles hard floors and low-pile rugs comfortably; high-pile carpet is where 8,000 Pa+ earns its keep. Don't pay a premium for headline pascals if your home is mostly tile or wood.
3. Obstacle avoidance is what saves your evenings
A robot that eats a charging cable or smears a pet accident across the house is worse than no robot. Front-facing cameras and 3D sensors are markedly better than basic infrared at avoiding cords, socks and pet mess. If you have pets or kids, treat this as a must-have, not a nice-to-have.
4. Mopping: useful, not magic
Most "2-in-1" robots wipe rather than scrub. The ones that genuinely clean floors use rotating pads with downward pressure, lift the pads over carpet, and — at the top end — wash and dry the pads at the dock. A vibrating or static pad is fine for light maintenance, not for caked-on kitchen grime.
5. The dock decides your involvement
This is where your money increasingly goes. Auto-empty docks let you ignore the robot for weeks; the most advanced also refill clean water, wash the mop, and dry it to prevent odour. More dock automation means less of your time — that's the real product.
What you can mostly ignore
- Battery runtime on any model that recharges and resumes — it'll finish regardless.
- "AI" object recognition counts ("recognises 100+ objects") — what matters is whether it avoids the few that actually trip robots up.
- App gimmicks you'll open twice and forget.
Decide your floors first (hard vs. carpet, pets vs. none), then match the robot to them. Our best robot vacuums ranking and side-by-side comparison filter on exactly these specs so you can skip the marketing.
