A primary caveat is that it is a massive platform designed to do many things, in it's own flavour of C++. As far as UI programming goes, it's very slow moving.

A primary caveat is that it is a massive platform designed to do many things, in it's own flavour of C++. As far as UI programming goes, it's very slow moving. Once you get the right flavour chosen, it's not so bad. If you are making an app for a Kiosk, like a ticket console, that's not going to change every day, Qt is a good choice, it's well supported. For other things it's a tougher decision.