I sat on the fence with this set for awhile. Then I started reading about how much people like it. I bought it about two weeks ago, and haven't stopped doing it since I received it. I usually do Cathe in the morning and then do Piyo in the afternoon. It has added a lot to my exercise program. I feel it works strength in a different way from Cathe, which is good. Also flexibility, core, and balance work is great in this set. I only bought the base set (so far. . .). I am following the rotation that came with the set. I can see using this set for a long time to come. I'm hoping there will be a Piyo 2 in the future!