Hi Sean We Looked at several sorts about 4years ago,we had a dunlop bar and old tecalimate bulb type. We bought the balco/hoffman laser unit the same as supertracker to replace them. Ideal unit, hangs on wall unit which charges it, Best thing is it aligns the steering wheel,so you dont have to keep going up & down the road, Can be used on floor or 4 poster. Unit just hangs on the wheels,and can do rear as well Very quick to use. Takes a bit of getting used to.the feller that demonstrated it was not to good,we sorted it ourselves. We paid around £1800 from partco. If you need more info (01255 241777) hope this helps