I am VERY HAPPY with the Cytech Double Park 7000 that we purchased in Sept 02. Bill Lewis was VERY patient and helpful in designing this lift over the phone given my garage size problems and LOW ceiling height (103 inches). The Cytech team delivered the lift assembled (!!!), rolled it into the garage with at least a couple of millimeters to spare, complete with bigger and thicker foot pads (as floor is poured over SpanDeck). Lift has 01 GTS on top and Gen I RT/10 below...pinlocks keep ME from putting GTS through the ceiling, and RT/10 has a FULL 1/2 inch extra clearance underneath....PERFECT for our setup and needs. Using a stool on rollers, I can fly around under any Viper on the lift for FULL service !!! Am comforted by the TESTED 21,000 lb. failure loading...giving a Viper over 5X safety factor. Our Tech director has several RECENT posts on the subject...he is a VERY THOROUGH GUY...who posts as Ron Try a search within past month or so.