9 ft ceiling would not accomodate this:
http://www.forwardlift.com/two_post/BP9.aspx
But others here contemplating a lift need to know that low overhead lifts do exist (this one needs a 10 ft ceiling.) Other companies have similar types. Certified, with all the safety features. If you have never used a lift before then you may not be aware of how important the safety catches are.
I for one would not put myself under the MaxJax
If I had 9 ft ceilings, I'd blow a hole in the sheetrock right above each of the two posts and go with the certified low overhead lift