I have a Black Dog in the bridge of my Gordon Smith guitar and love it.
1 thing to watch out for, when they route the guitar they route the pickup cavity to fit the pickup they fit at the factory. If you fit any other pickups after this, it may need a little extra routing, depending on the pickup you fit to it.
When i ordered my Gordon Smith, I sent him 2 Duncan pickups to put in it. But when I came to change them for Bareknuckles, I found that they wouldn't fit, due to the shape of the pickup legs. The pickup cavity was also too shallow to accept the Bareknuckles, so I had to route the guitar slightly to make them fit.
Just something to look out for :)