That sounds interesting. My understanding is that it's much the same stuff as Special B and Weyermann's Special W. Simpson"s Double Roasted is the same thing, too.
I've used it a few times to add a touch of sweetness, never more than 3-4% of the recipe but that just my taste. Had a similar profile to Special B, I got a slight raisen taste. I got the impression Special B was a little stronger in taste.