Has anybody used the Isimple AuxBox with the IsimplePXHX GM adapter? I'm asking because I'd like to switch out my head unit with one from a blazer or nbs truck with the CD player in the head, and replace my CD slave unit with a pocket. With this kit, it seems you don't need to have the slave unit installed... It's like twice the price though, and reviews don't seem great. I guess I could keep the slave unit, but I'd much rather have more storage