Yes it does work and very well i might add. I used to be in the auto restoration business (not old cars but used cars for dealerships) I was fortunate to meet a few of these guys and they walked me through the process. They do have to drill a small hole to allow thier tools to get to the dent, but they plug it with a nice looking grommet type plug. If you didnt know better, you would have no idea anything has been done to your car. Its like they almost rub the dent out, and also hammer it when needed. Like said before, if the paint is chipped or creased it will not work. Also if the dent is too close to the edges of the door or where ever they might not be able to get it out. But i would recomend this service to anybody who has a lot of dents or the pesky door dings. Witch pisses me off more then anything, especially when you catch them doing it and they just walk away like nothing happened. Had a giy in a huge ass Excursion park right next to my lil sentra, in a compact space no less. I was in the store right in front of my car, and noticed when the guy got out of his truck, he looked at his door and then ruubed something off of it. I told my old lady Oh Hell No ill be right back. So I proceded to confront this guy, and he acted llike i was bother him. I almost knocked this dudes head off. Fortunatlly there was an on duty cop in the shopping mall, and he got it settled for us. I tild the guy just give me a check for the parts and i wont say a thing to my insurance. I was only asking like 200 bucks. But he was an ass so i got it priced and the highest bid was 350 bucks. New Mirror, paint and installation. So i took that check and still did it myself lmao.
Sorry i think i was rambling. But i just had to vent my frustrations somewhere and i know you guys know what i am talking about.