I don't have one but have looked at several different makes that friends have. Most are good and will last a long time. The main thing I looked at was not only the quality of the build, but the locking mechanism as some of them seem kind of flimsy to me and I sure wouldn't want the top car crashing down. One has the casters on his and it works great as he rolls it out into his driveway when he wants to work on his truck which is a little to high for the garage ceiling he has. I do prefer the four posts over the others as they just seem stronger and more stable to me, but that is just my opinion.
Ron
