Yes. I have a regular P-Rail in the neck and a P-Rail Hot in the bridge.
The P-Rail Hot is mounted with the rail next to the bridge with an UOA5 mag next to the Rail and an A5 next to the P-90. The stock A8/A8 mags were way over the top on this pup, but with these mags it works great in the bridge and I can get some of the nicest cleans ever, from rich and mellow to bright and twangy to thick and bassy.
The regular P-Rail is A5/A5 and is in the neck with the Rail toward the bridge as well.
These sound amazing in my Schecter C1 Hellraiser and is now my #1 guitar. Extremely versatile and sounds amazing for anything I want to play...Classic rock, soft-hard rock, blues, country, jazz, and yes, even some metal.
I admit that I use the P-90, both in the neck and bridge, most of the time (about 90%) because it sounds soooooo good. I have a couple GFS Mean 90's (which I love) and a couple Gibson P-90's, but the P-90 in the P-Rails is my favorite by a long shot. I like it better than the '59, Pearly, Demon, any of the Customs (including the C8), Dirty Fingers, Classic '57, any of the Burstbuckers, etc. Don't get me wrong...I really like all of these other pups, but this P-90 in the P-Rail Hot with A5/UOA5 is the best by far.