I have a PRS Custom 22, without tremolo, and I've tried a couple of BKPs - Nailbomb bridge, Cold Sweat (both neck and bridge), and Holydiver set.
Less versatile combo - Holydivers, but they nail 80's rock\metal tones perfectly, and I haven't found them smooth as described, thay are pretty midrange-agressive pups, focused and dry.
I tried to dail right height to make them "smooth and fat" but haven't succeded yet.
Crawler in my Suhr is much more smooth, thick and less cutting, actually I like it more than Diver (also I like Suhr more than PRS, he-he) :lol:
Currently I have them in my PRS because I need a good cut through the mix on leads (we have another two guitarists in the band, and also a keyboard player).
I play heavy progressive rock, close to metal.
But my favorite for neck PU would be still Cold Sweat, on of my favorite pup's ever.
Nailbomb also great pickup, but more modern voiced (say, modern, new-metal) than CS or HD.