The astronomy campus I used to make regular visits to had a pair of 36" Dobs. They were tall enough that you would need a ladder of some sort to reach the eyepiece depending on the position. I only got to view with my eyes, but they were impressive compared to my 6". I always wanted to try imaging from one of those. The same place also had a pair similar to the link you provided, only, they were set up to be a stereoscopic viewing. I never got that experience though as nobody ever wanted to go through the painful alignment process. People have come up with some interesting ideas on how to view the sky