I got the moonlite CR2 for my 10" GSO dob, and I love it. I had to drill new holes to install it, but it came with a template and mounting kit so it was no drama.
Details here.
The moonlite CR2 is lovely, the 8:1 ratio on the slow mo knob is just right.
I've also motorised it, DIY style - details and pics here:
http://www.iceinspace.com.au/forum/s...ead.php?t=2116
I only use the motor when i'm doing imaging, because it's crucial that there's zero image shift so you can actually see what you're focusing. For visual stuff, using the slo mo control is good enough.