visit bass pro, midway, cabelas and read the powerbelt reviews. Most of them are all positive.
I've actually USED them for more years than you have complained about them.
I know how they work, we've downed a lot of deer and elk with them since '02. I've shot other brands that I personally will not use again, but if I have to use a powerbelt for whatever reason, theres no doubt in the back of my head that I will come home with meat.
No bullet will make up for your crappy shooting.