We bought the Hoffmann (Supertracker) laser alignment system. One of the best (and most profitable) bits of kit I've bought. Easy to use, once you get used to it. We charge an hour front front alignment, 1.5hrs for all four (average). Have had no complaints as alignment is usually spot-on. The difference an accurate four-wheel alignment makes to the handling most cars is surprising. I think I bought from Camberley Auto Factors.