I am using IntelliJ for Android development (only), and I must say, I LOVE it.
Using resharper too, for Visual Studio, both great tools.
The only question I have, does it make sense to switch to full version (beside the fact that I love to give something back to you guys). I would have to justify buying it, and on first glimpse, there seems to be no feature really important missing from the community version.
But I am at a point where I spend 50+ hours a week working with IntelliJ for my projects, so if there are features missing (which I don't miss because I dont know they exist), I would love to hear about them.
Don't get me wrong, I dont want to buy it if I don't have to (currently my apps don't make this kind of money), but if it saves a lot of time, it may be worthwhile. But most of the time, the professional versions are more focused on e.g. ORM or other fancy features, I dont use with Android anyway).
So, developers (pure Android), with a professional version, why did you switch :-)