As an end user, Qt apps do not feel particularly great. There’s just a lot of weird behavior in them and they just really feel off. At least that’s how the official demos from the Qt Company feel. I’m not sure how a real production level app feels. I’m not aware of any major apps that use it.
Interesting. A lot of open source software uses it via the python bindings. What do you mean by feels? Slow? Look? Layout? Isn't it all os-native widgets?
On mobile I don’t believe it uses native widgets. I think the official Qt Company demos are done with Qt Quick. They just look off, the rendering of the controls isn’t quite right and some of them don’t handle screen rotation well.
It’s been a while since I’ve tried them though, maybe it’s improved but about a year or 2 ago I wasn’t impressed.