Just started learning it. Me and a couple other people are going to be making a game on it soon, and we just decided to use unity over unreal. Its got an amazing workflow, and I love that it reads .ma files.
Half the time, I can't see, the other half of the time it just hurts to. I just found out that it's called Computer eye syndrome or something - can't remember. Plus my vision is getting poor with age, and I'm usually drinking a little.
I also tried the ArmA 2 demo and while it runs pretty slow even on the lowest possible settings, I am seriously amazed at how good it is (the AI and injury system specifically, and radio chatter) and I wish I had a good PC to play it.