I'm currently rewriting my Mac application. Its prototype was written in Qt, but I'm now dropping Qt for several reasons:

1. I demoed my application to my friends and they all complained that it didn't behave exactly like a native Mac application.

2. Qt5 has a lot of UI bugs on Mac OS X.

3. The LGPL license of Qt may not compatible with Mac App Store [1].

4. I could buy the commercial license of Qt, but it's $215/month for Mac OS X. I don't know if my app is going to sell at all, so I can't afford that kind of burden.

[1] http://blog.qt.digia.com/blog/2014/10/01/benefits-of-the-ind...