I bought the Ding King. And in the words of that cool dude 'It Really Does Work!!'. It really does! Its easy and fun to do. The hardest part is getting the glue crap off. But just get some rubbing alcohol and some elbow grease and it'll come off.
Yeah man, I got mine from Pep Boys and went at it with my car, took out at least 6-7 dents so far, the shop would have charged me at least a couple hundred for that.. and I bet you take your car in there, and they pull out the ding king ;p Still got a couple more to do, but all of em from the hood and what not are gonnnneeee.