I have 12ft ceilings don't come close to crushing the roof. My reasoning for buying it was for the ability to not have a post blocking the middle of my garage. It takes about 10 minutes to setup, I perform the work and then another 10 to take it down.
The Maxjax is great. My garage is about a car and half wide and leaving a post permanently mounted would have really messed up the feng shui.
I had to make new shorter arms to fit this cab, but it beats spending the money on beer and pizza for a bunch friends to lift it off the frame.