I like mine and it works effectively (Eufy - nowhere near £400 - I think it was about £120) but with several caveats.
If I use it in my kitchen/dining room, I need to move all the chairs and breakfast bar stools out of the way, lift the (floor-length) curtains out of the way, make sure there are no trailing cables (floor lamp, phone chargers etc) - basically give it a completely clear floor space so that it doesn't get stuck or tangled in anything.
Bedroom - I need to lift the bedside tables onto the bed, unplug everything so no trailing cables, curtains lifted out of the way, bedside rug moved etc. Again, I'd normally just use the nozzle on the regular vacuum cleaner to vacuum around cables, tables etc and move them around a bit as I'm doing it.
Often by the time I've done all this prep, I feel I could have had a quick spin round the room with the regular vacuum cleaner for the same effort or less. I must say it isn't quite the miracle worker I thought it might be.