problems solved: it works mostly on its own. It takes 5h instead of 2h as it's less efficient, but it's 5h during which I don't even need to be in the house (or could work).
Bonus: as most of these robots are flat, they easily vacuum under furniture.
Even more useful if you own pets and need to vacuum the shedded fur daily.
But result will depend on the clutter, the amount of furniture blocking the way, the algo used by manufacturer / gen, and extras like self-cleaning
