We have chosen Qt for our new cross-platform app (Android, Windows, MacOS) which we've developed for the past 1.5 years and have overall not regretted it. Doing UIs with QML and Qt Quick is so much faster than Android's XML based system and gives you a lot of flexibility.

However there's a bit of a UI rendering overhead, although I understand they made it faster with Qt 5.7. And OpenGL integration is more complicated than doing it natively since you have to understand Qt's UI scene graph system and the way Qt is threading things.

But overall it's been a good choice so far.