I don't have experience with the early Roomba models, but I am using a Roborock S50 (Xiaomi vacuum) for almost a year now and couldn't be happier. I don't have a carpet anywhere in my house and it works pretty well.

We bring out the regular Miele vacuum once every week or two to get to the spots that Roborock can not reach.

The only issue I have at the moment is that I am working from home and vacuuming takes a lot of time for these robots compared to using a regular vacuum.