the juggernaut is a definite favorite of mine. it worked great in my les paul custom a while back (mostly mahogany) and works great in my alder strat. it works very well no matter what tuning you use but it certainly excels in lower tunings. its very articulate. responds very nicely to pick attack. and the highs arent shrill or anything like that. great great low end but not over the top. it really is just something that needs to be heard in person to believe. it really blows a lot of the competition away. cleans are amazing. very very nice for a medium-high output pickup. its an animal. it is a very versatile pickup.
also, before i pull the trigger on BK's i'm considering trying another brand that i've heard good things about. The Creamery, also based out of the UK. i contacted the owner about what i'm looking for and we'll see what he says. his 7 string section says he can make basically any of his humbuckers into 7 string versions but he can also make custom pickups with different magnet choices, and output requests. etc. his demos sound amazing