I have it (version 1) and it's pretty good. If you haven't ready the tailor-made series he wrote here, read that and it will give you a good indication if you'll like it/if it's a good fit for you (the articles are actually included in the PN kit).
I only followed it strickly when I was cutting weight, but it worked well for that. I'm not one to stick to a strick eating plan day-to-day, but I'll still use some recipes.
Basically it depends what you're looking to get out of it and how well you adapt to eating plans.