Trevor, Good to see someone got their GSO RC out.. I am STILL yet to use mine do to the inability to balance it.. with the SBIG hanging out the rear of it there is just no way in hell im going to run the mount with such an imbalance.. I've ordered one of the vixen style counterweights from ADM to address this issue.. 3.5lb of weight hanging off the dovetail right at the front of the scope should be enough to see this issue sorted, then I'll be off!
The M5 image looks good, and stars do appear uniform across the image plane... Spend plenty of time on collimation... From my understanding talking to a few people in the US, they are a real pain to get from "close" to "perfect" collimation, however the time spent doing so is worth the hassle.
Cheers mate
Alex.