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Hi Steve
I have both an 10" and 12" GSO dobs.
The 10 is now almost 13 years old and the 12 would be ten.
I can't vouch for the quality of today's GSO mirrors but, a decade ago it was hard to find a bad 10", anything bigger was a little bit hit and miss.
I still love my 10. Its had the primary recoated, the tube 'flocked' and the base has been rebuilt in marine ply. I don't observe as much as I use to but, the 10 is the goto scope when we go camping or just setting up in the backyard and its easier for the kids to have a look through. Plus the tube will lie across the back seat of a Corolla....
I may have been unlucky with the 12 as it never offered the nice pinpoint stars the 10 did. Its light gathering abilities far surpassed the 10 though, and was great for galaxy hunting.
Cheers
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