My local music shop started stocking them sometime late last year and had them displayed in the window. When asked about them, the sales guy was raving about them, saying how good they were.
At the time I was looking to replace the SD's I had in my Tokai Love Rock cause they sounded too clinical, and without any mid detail, which I found annoying. Anyway, did some research into BKP's, found the website and a couple of reviews for different pickups.
I saw the detail of the Black Dog set, and thought that they would meet all the requirements I had. Luckily enough, the music shop had a Black Dog loaded Love Rock in to try out, so I plugged it into a Cornford Harlequin (the 6w combo) and tried it clean, with gain and a couple of pedals and was impressed. I ordered a set of Black Dog's through the shop, and they installed them for free.
I was that impressed, I bought a set of Emerald's to go into my set neck Iceman.