The 6" Dob is a nice scope, nothing really wrong with it. The focusser is a bit of a cheapie compared with 8" models and up (ditto finder). But it's a great all rounder; I was impressed with its performance on planets at a star party. But the only reason to get it over the 8" is cost. It's essentially the same size as the 8", except for the diameter of the tube (and mirror of course). And it's a little bit lighter. But otherwise it's no more portable than the 8".
PS. I'm referring to the 6" f/8 Dob and not the f/5 table top model. The table top model would be okay if you want something ultra-portable.
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