They are. Xiaomi owned Roborock is years ahead of the big western competition (iRobot and Neato) in terms of cleaning chops and value for money.
Privacy though, is another matter that never gets benchmarked, but there's also no guarantee yet that the lesser western brands will pinky promise to keep your data private and not sell it to advertisers for money or leave it in some insecure S3 bucket for hackers to steal because they outsourced the SW dev work to the cheapest body shop, which is the norm in SW development for consumer electronics.
At least on most Roborock models you can root them and run them locally via Valetudo insted of their proprietary cloud, so you get the best of all worlds: cleaning, value, privacy.