I liked the program immensely. I finished it now. Currently I'm not doing any heavy lifting, since I got a new job that requires a lot of physical labor. I just do 2x10 for squats, dips and pullups - I feel those three hit the entire body nicely, and can probably develop solid, functional strength.
I still do the movement prep exercises daily, usually in the AM to get me going. I do the Rotator Letters (Y, T, W, L) on the ball every other day before my workout to keep the rotators strong. I also throw in glute bridges every so often.
After my prehab moves and strength moves, I go ahead and perform ab movements. Usually I do frog kicks, dragon flags, and decline crunches. I use two sets for each (mind you, this is every other day), with 25-30 reps. Once I can easily knock out the reps, I add a little weight. I don't want to use less reps, as that will give me the desire to raise the load and I'd rather not have my abs too thick, though I feel this strengthens them well.
That's my workout day. As for my "regeneration day" (like that term from the book, and I'm not really resting every, anymore), I still continue with movement prep to start. I follow that with reverse hypers on the ball and front and side pillar bridges. Those are great for core stability, and I feel they'll keep me in good health for a long time coming. I throw on ankle weights with the hypers to strengthen my back more.
Finally, and this applies to any day I see fit, I throw in AIS stretches and foam rolling.