I have tried and liked many different pickup makes and I have many BKPs in different guitars.
Price is from UK small scale manufacturing + exchange rate + customs/shipping
What I find special about BKP, besides the excellent customer service and direct contact with Tim Mills, the owner, is that they don't just have a sound, but they have depth, extreme dynamics and versatility. Indeed a pickup must match a guitar, which is why I would always recommend to contact Tim upfront stating the type of guitar/woods, current pickups and what you don't like about them. He will recommend a set that usually is a great match - and if not he will exchange it for another set.
As for the pickups, they just sing. With production Duncans or DiMarzios, I find that they can sound great, but they sound the same on two notes or two chords if you hit them, whereas with a BKP, every micro change in pick angle or picking velocity will yield a slightly different voice. As a result, you can produce much more lively tones than with a mass production product IMO. Maybe it's a bit like the difference between a modeler and a real amp. There is just something to it that you feel and hear when you dig in that makes the real thing more desirable.