I had very positive experience with a Black Dog in my SG, although I sold the whole guitar two years ago.
Everybody told me "too dark, too many mids", but I found that the BD added a lot of mid range definition.
I did tweak pickup height (quite high) and pole pieces though. I also put 500K pots in. Great "zing" then.
The bigger problem I see is that SGs are very varied in their tonal attributes - results can probably differ a lot between instruments.