Though there are quite a few posters that like the old VS gut, I'm very happy with the BT7 formula.
I read a little more on the formula change and now Babolat uses 7 thicker strands of gut instead of the previous 15 thinner strands. My only gripe is that I've had 3 VS gut jobs pop overnight in the last 3-4 months. I was never able to be sure why. But this hasn't happened in a while, though.
VS (in my case Team) / 4G is a sublime hybrid.
Steams 99s, leather grips; 4G @58lbs; ZX 16 / marathon 15L @62lbs