Yeah I was in the same boat as you...the BH were great and I never thought I needed anything else, but I had a chance to test these and was shocked. Checkout the Rockers as I think those even look better than the Growler's and will give the BH's a run on looksThat's what I here, but for me I am kinda partial to the way the BH1's look, kinda like the white letters, and they really have always been super tough.
I fully admit to the fact the Pitbulls have better traction in most all situations.
But I have not really had any instances where my BH1's were at fault for getting me stuck. So I can't really complain about the BH1's traction. A buddy has the Pittbulls on his Outlander, so I'll get chance to try them first hand here in a month or two, on our next big group ride. Everything I have seen so far, the PBs are great tires.