I had one but it kept getting lost so it couldn’t find its way back to the charging plate or jamming itself under furniture so I gave it to my son who has tiled floors and a far less cluttered house. He told me it worked well. They also have quite a tiny dust storage capacity so need emptying often.
I find my carpet sweeper ($23 from Bunnings) far more effective especially for dog or human female hair.
I’ve just had a look at robo vacs - Maybe OK if you are very busy and have a large floor area but I can’t see the benefit in my tiny bungalow.
Although I’m all on one level, it takes so little time to vacuum round the whole bungalow - and looking at the space needed for the charging station, I think I’d struggle to find space for it, without tripping over it in the hall or having to look at it in the main living area, which I wouldn’t fancy.
Now if it was a robot lawn mower, I may be interested - my local hardware shop operates one on a large area of lawn outside their shop in the growing season and it keeps the lawn looking immaculate.