Hi
I have the Orion 12" solid tube goto dob. Excellent build and a really nice telescope. Goto is excellent and as other members have said quick and easy to setup.
The solid tube is a big beast but I'm 195cm tall so my arms are long enough to carry it length ways outside, taking the base out just before. Collimation is pretty much held but I do check it with my laser every now again. I went the solid tube for that reason on the advice of Michael at Bintel. I've tried getting my DSLR to focus in it but have up. If I want to take a photo I have a Tak for that
Good luck with your decision and I hope my insight is of benefit.
Wayne