I have the manual.
It's probably the best program design text I've ever read (there's a thread about it over at jpfitness. com).
Compared to Poliquin's text (which I also have) in terms of price it's less than half price and is just as good.
It's cheaper than anything by Paul Chek or NASM or any of those guys.
It is designed for trainer's though. So I think it's worth it as anything I can do to increase my ability translates to more demand from clients and I'm able to charge more. If I put my fee up $5, with two, twice a week clients - the manual pays for itself in a few weeks.
If I wasn't a trainer I don't think I'd purchase it, but that's an unfair criticism as it's clearly marketed as an alternative resource to the BS certifications out there.
I wish Alwyn had included some "bonuses" with it though. I KNOW that stuff is sales hype, but it's COOL!!