Has anybody here tried the MOGA controller? Thoughts on it?

I'm thinking of buying one. The only thing holding mobile gaming back, IMHO, is the lack of physical buttons. If Google aren't going to implement a game controller library in their SDK for developers to use and for third party hardware manufacturers to build to (similar to the 360 controller for DirectX on Windows), MOGA is the best we can hope for I guess. But is it any good?