I've got 2 Tokai Love Rock's, my main one has a set of Black Dog's in it, and I have to say that they are the main reason it's my No. 1 guitar (well OK, it feels right as well!). My other Love Rock has a set of Emerald's in, and they too sound wonderful, but if I were replacing my #1 with another LP type guitar, whatever I got would have a set of Black Dog's installed.
They're a "medium" output pickup (bridge is around 10k, and the neck is about 8k), and they have a wonderful mid-y tone to them that I just absolutely love. They were my 1st set of BKP's, and I'm well and truly hooked on their sound and tonality. A really underrated pickup IMO.