Has anyone had success with the 6 Week Body Makeover eating

My mother bought the 6 Week Body Makeover plan a couple years ago and never used it, so a friend and I thought we would give it a try. Looking through the packet, most of it seems like common sense. Cutting out all sodium will probably be rough in the beginning, but I never add salt to my food anyway so it is just a matter of learning to cook a little differently. No dairy is going to hurt because I LOVE ME SOME CHEESE!, but I figure 6 weeks is nothing, so I might as well try Realistically I need to lose about 40 pounds, so I was hoping that it could give me a good jumpstart on my weight loss.

So, for those of you who have tried it :

Is 10 to 15 pounds too much to expect on this plan?

After completing the plan, did all the weight come back as you began to incorporate normal eating again?

Any insights or advice anyone can share would be greatly appreciated!