These are HOT P-90s
Over two years of use and comparing to many high-end Humbuckers in two Gibson LPs ('92 Standard and '04 R8), these have become my pickup of choice for both high output and P-90 tone. They are higher-output than most PAF-style Humbuckers, but with that inimitable P-90 clarity and smooth bite.
If you get one, put it in the neck, and try it in the bridge as well. My bridge Cat came with a lead too short to reach the neck, so I'd recommend against buying only a bridge pickup first.
With both pickups on, they are hum canceling, but mine don't hum any more than Humbuckers anyway.