I tried it and I can say it's also quite stable. I can't tell much about competitive performance and latency though because I'm no competitive gamer.

It is insane how smooth it is it blew my mind

Even further, there's also a clean split between the game and the framework they've built for it. So people can actually build their own games or tools using the osu!framework, and some already did so.

Which is neat, because it seems to me like it's really performant and of course, low-latency, based on what I've seen trying the new client.

Lol ikr it's the best thing I've ever seen in a registration form

I don't think so. It's a global competitive game where everything you do is public afaik.