Been primal for going on 6 months now. Started fairly lean and got really lean. Photo of where I started -- I was still mostly vegan at this point -- eek!: http://inthenightlife.blogspot.com/2...-year-one.html
My compliance is quite a bit better than 80/20. More like 98%. I suspect that this is necessary to get ripped, as opposed to just reaching a perfectly acceptable, but not striking, body composition.
And, I get a bit more physical activity than the PB's minimums:
Mark recommends at least 3-5 hours of "moving slowly" per week; I get at least 10 hours, often more like 15 or 20.
I lift heavy 2x per week, do sprints/metcon 2x per week, do "gymnastics" (bodyweight, etc) 2x per week, and rest/play 2x per week. (Yes, that is an 8-day week.)
I try hard to get plenty of sleep, use my brain, minimize stress, get adequate sunlight, and all those other important PB components that we don't discuss as much as nutrition and exercise.
In short, I think the PB totally works, but for really stellar results, you have to put in more than than minimums.