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Matt
I've got a 10" GSO RC and to be honest it holds collimation and focus exceptionally well. Sure the CF scopes look really schmick but remember both the 8" and the 10" have large aluminium rails top and bottom. So no matter if you have a CF tube you have these "expanding" aluminium bands on your scope, theoretically. I find I would need to re-focus maybe 2 - 3 times if doing it manually during the night with dropping temperatures but now I have it all done by software doing autofocus each degree drop of temperature and on filter changes. The software is cheap ($100) for full camera, scope, filter and mount control as well as the focuser and a lot more.
Allan
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