not seen the 20 buck jobbies, but can imagine just how good you would be with one
I have something way better, just my skill set would be same as yours when it comes to the refinement required to fix the things.
I have found in summer, the US sourced glue sticks would let go the paint, in winter, the glue let go on the puller side.
Snap on did a glue puller kit - comes in a first aid kit size tool box, bit over 800 bucks.
A decent US sourced dent pusher kit about 3 to 5 k, then there are the intensive one week courses for about five grand, and if you just cannot get the hang of it like a greater number of them I suspect, you got youself a fancy set of pool cues or golf clubs.
I've watched the pro's , seen stuff they have done before and after, with years of experience.They can get overuse injuries getting to that level. The 20 bucks on ebay ??? Be a waste of money if you thought you could duplicate results . I wasted a lot more on DVDs and my mini-lifter , though in the hands of a pro, sure th tool will work wonders