I don't pledge loyalty to any one pickup manufacturer. I use EMG, Duncan, DiMarzio, Lawrence, Schaller, Gibson, Fender, and loads of cheap copy guitar pickups on the stuff I build or modify.
I also love performing wacko pickup experiments from time to time. My B.C. Rich Ironbird bass had it's single DiMarzio P-Bass pickup's pole pieces swapped out with the Aluminum Oxide cap screws from a low-end-version of a Seymour Duncan Invader humbucker. I also had a Harmony H802 pickup mounted in a former "junk-built" guitar using an upside-down humbucker frame to mount it to.