Why in the name of common sense would anyone want a vast frame hanging about the place taking up space (what do you do when not in use: park on it??) Might be OK if you need something that can be moved fairly easily but then if that is what you need a low rise lift with the mobility option would be a far better proposition for not a great deal more.
http://www.jbmcneillgarageequipment.co.uk/5.html
Single and two post lifts also can be had for much the same money so really it has more than a hint of the not very well thought out contraption about it.
3/10. Could do better