I've got a 10" GSO dob and I really like it. The optics are pretty damn good, I have viewed DSOs at up to 600x with very nice results. It stacks up very nicely to my premium 12' dob.
I have to carry mine down 3 steps and it's no trouble. Main thing is, take it easy on the steps, don't rush! The 10" tube I think weighs about 17kg, the 12" will be ofcourse considerably larger both in bulk and weight. The 10" will fit across the back seat of a car, but the 12" i think won't.
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