I need this. My back isn't what it used to be, so when it's time to fiddle with the undercarriage, I start thinking wistfully about lifts or pits. It'd also make it easier to hang off the end of the breaker bar for those monster-torque suspension fasteners. Exhaust work? No more lying on your back, rust crispies falling into your mouth, embers from that bolt you're torching out ending up who knows where. Of course, it's always a plus to make sure there are no fluids in the car, or they'll remind you of their presence once you get the car on its side.