I'm working full time on a game development project in Unity. I have nothing but good things to say about it. The community is great, and our development would take twice the time without community-created tools like NGUI and PlayMaker. Unity 4 will address some major irks of mine (esp. animation handling), and a new UI engine is down the road.

Its Javascript support is probably what's drawing you to the engine though (I use C#).