I wanted one... researched them, asked around here for suggestions, etc. In the end, I spoke to a contractor about my garage ceiling height (actually, how to raise it), and found that it is very possible to cut sections out of 4 or 5 trusses, and then box them in on 3 sides to add 3' or so for clearance.
The ceiling is 10' now, so I could get the S10 or GTO fairly high, but that MOD is a few years down the road. I'm still young enough to lay on the concrete .