I've been doing PB for a little over 2 months. I've lost 13 pounds and I look pretty good; at least I think so... In Mark's book he says that everyone has a six pack underneath their fat. I can confirm this is true. Not only do I now have a six pack, I look very muscular overall.
I've had absolutely no problems following the PB and just laugh inside every I go to the grocery store and leave with my whole cream, eggs, bacon, berries, and hunk of meat.