I am starting week 2 today and I have to tell you.. those DVD's kicked my A$$. I was sore all weekend. The foods not as bad as I thought. The breakfast scrambles arent really my favorite though.. too many egg whites.
If you know how to follow a workout eating and supplementing plan, it's pretty simple to do without their products. Keep healthy snacks like almonds around and if you know how to build yourself a 40-40-20 plan, do it. 4-6 meals a day as previously mentioned and lots of chicken, fish, bison, etc.
Anyways.
The best tips I have given to friends who have tried this are:
1) Do the abs video before the daily workouts if you want to try to get it all done in one session. Hip flexors and stabilizers won't hold up otherwise, especially early on.
2) DO NOT skip the stretching and Yoga. I was skeptical of the yoga but it quickly became one of my favorites. Most men are not nearly flexible enough and while I am pretty flexible, the focus on hip flexibility helped tremendously with what is otherwise a chronic back issue. And it is no joke, definitely hard but you don't feel nearly as stupid with it after a few weeks and getting all the moves down. The first few sessions you'll feel like a wet noodle flopping around.
3) Get a heart rate monitor. I was working in a WAY too high heart zone for plyo and really had to monitor myself to keep within proper training range
4) Listen to your body. Muscle soreness and recovery soreness are one thing, but with the repetitive pushups and the plyo, you can very easily develop tendonitis or other issues that will put you on the shelf for longer if you don't recognize and account for them before they really flare up.
Good luck, I loved it and everyone I know that has done it has had great results, but you definitely need to have the time and determination to get it done.