I think the BFL diet and exercise concepts are good.
The only thing bothersome is the "transformation" pictures they show. While certainly inspirational, most people should not think themselves a failure if they themselves don't make a similar transformation in just 12 weeks. I'm not saying it can't be done, just that those aren't average results. Some of the people pictured have entered more than one 12-week BFL Challenge, and they're showing the very first and very last picture.