The Mommy Style plan sounds like a self hypnosis plan. Or something like that.
It seems like its goal is to help you stop snacking mindlessly, which is totally doable on your own.
A book I liked that deals with this issue (amongst others) is the 10 secrets of naturally slim people. I got it at Target for under $10, I think, but I'm sure libraries have it now.
I'd be more inclined to spend the money on a gym membership, or a subscription to Cooking Light, or visits to a personal trainer or nutritionist, but that's just me.