I've been using StellarMate for a few months. It's always worked for me... but had some quirks which I kept having to deal with... auto-focus, meridian flips, polar align, etc. However, I updated my RPi with 1.5.8 and everything worked right away! I had a great session last night and used align, plate solve, auto focus, guiding (PHD2), and meridian flip... and everything worked perfectly. I'm going to try the internal guiding tonight. I would like to use it to simplify my environment.