My pickup arrived today and I installed it, no problems for me either. I have the pickup rings in place too, they do the job perfectly, and I'm really happy how easy it was to make the changeover.
As far as the Painkiller itself, it's simply the most savagely aggressive pickup I've ever used. "The Metal God in a pickup" really is spot on. Not only that, it has exceptional string definition and handles the low B with ease, too. I didn't expect to be blown away to the same extent as I was when I first installed my C-pig in my 6 string, but my expectations have been exceeded once again.