Kate: Not everyone gained 2-3 pounds back. I didn't. Hope you are enjoying Phase 4.
Ken: Kellogs Special K Protein is Ok, I order low carb high protein products from Netrition.com. Healthsmart cereal is good. I started off using the IP packets for Phase 1, but now just eat low carb for Phase 1.
Everyone here is doing a different approach. Some do as you wrote..mainly p3 then a fun day and then p1 to catch up. I just stick to mainly P3 and once in awhile indulge in a fun meal. Then I do P1 to get back down.