I've just finished my 8th week of TBT and I love it so far. I've put on about 5-8 lbs give or take and all of my lifts have gone up. I was wondering the same thing and so, being the Waterbury nuthugger that I am, I'm giving ABB workout a try for probably 4 weeks, just for a change.
But I'm just mixing it up for a mental break and plan on going back to TBT after that. It has worked great for me.