The well known guitarist Richie Kotzen (Mr. Big) uses rail pups in his guitars. I'm not sure what model they are but look around the web and you can hear him and find out which pup he uses. His tone is really good...not to mention his playing.

I've had a super hot rail pup for years now but have yet to find a guitar that I like it in. IF you do go with rails from GFS I would suggest to go with lower output for more tone. At 15-16 ohms mine is WAY too hot.