right now I have a Black Dog in my main les paul custom '73, paired with a Mule
it's very low output compared to the other bridge BKPs (NB, CS, AM, HD) I had in this guitar, so I use it very close to the strings to capture maximum picking response
you might find it a bit weak for heavier stuff, but it becomes a monster with the booster on (I use a 1980 maxon equalizer set up for a slight upper mid boost right after my crybaby)
it's quite smooth and not a tight sounding pickup without the boost, though, but some amps will correct that
the first thing that came to mind when I first plugged it into my modded JMP was early Soundgarden
search Joe Kataldo's videos on youtube
his Black Dog/Mule set videos are very consistent to what the pickups sound, although he doesn't have them in a les paul
but I think he uses a Mesa Mark, like you
if you're confident that you want low output, it won't disappoint you
but if you want mostly openness and you have a darker sounding les paul, the riff raff is the man for the job
easily the clearest humbucker pickup I ever had
