Here's my dob! I had an XT10i before going to university that was sold to me at a very fair price by a veteran amateur. Being very close to graduating now and working full time, I found a used XT12i that was in like new condition. I've been able to take it to a dark site (Bortle 2) once and use it a few times at my home (Bortle 4) in the last month and have been really impressed with the views. I have added a telrad, a cooling fan, and a convenient laptop arm that I was inspired to make from an old post on the forum. I use SkySafari on my Mac mainly, wired to the intelliscope hand controller.
My next steps are to improve the focuser, I am interested in the Lacerta Dual Speed 1:10 Microfocus Upgrade Kit. And of course, adding some eyepieces over time.
Really enjoy this thread. It may inspire some further ideas.