Hi Bird,
No I haven't had a bad experience with Gemini. It works as it should. The UI is pretty nasty but it seems to work ok.
It is way too over-priced however!! Which is the main reason for my comment..
I have done a design for an alternative GOTO for Losmandy, but so far haven't done anything. I'm currently looking at integrating the star-mate product with the ArgoNavis to give a cheap GOTO version for Losmandy. I'm currently on the hunt for some decent motors. With my system I reckon I could do full goto plus wireless remote for under $1000 (including the cost of the AN)...