I had a 12" GSO dob and it was a great scope, the only reason I sold it was because I bought its big brother the GSO 16" Strut Dob which I still have. Both of those scopes had/have great mirrors. Don't be put off be the inevitable knockers who have never owned one. From a value for money point of view they are great. GSO mirrors are surprisingly good, and I recently used one in a 10" imaging newt I built. The scopes are fairly heavy but a 12" can be easily moved around with a trolley. The solid tube 12" can fit in a car to travel to a dark site but it's a bit awkward to handle. If portability is important the sectional dobs might be better for you.
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