I have a C8-XLT on an CG5-ASGT mount with an Orion ST80 plus flip mirror and guide camera on top. There is a Moonlite focuser and either QHY8 or Sony a200 on the back of the C8. That is about the maximum the mount will carry.
When it arrived the backlash was pretty bad but it would track as long as you kept the exposure time down.
It had to go in under warranty for a circuit board failure and they fixed the backlash so now it tracks better, but still not really good enough for long exposures. About 5 mins is the limit.
If I was starting from scratch I'd get a different mount. Probably a Losmandy G11. The Celestron CGE-Pro is just too expensive.
The genuine Celestron GPS unit is definitely not cheap, but I never get the time or location wrong.
There are a few sample moon shots in this thread:
http://www.iceinspace.com.au/forum/s...ad.php?t=58976