I was considering one and even built the shop and over poured the slab to accomodate one. Half of my fleet are the big bolts and I didn't want to work around the posts that the trucks would have to squeeze between to get into the shop. For now I've decided against it until I get too old to lay under the trucks (which I don't think will be long). Besides, I use one at work everyday. I have access to a dozen hoists every week-end and evening so I thought I would keep my floor space for now. Besides, it's hard to have a barn dance with a shop lift right in the middle of the floor.
Scott