I have all of Cathe's old videos through CTX but not the Pure Strength or Imax. I'm thinking of getting the Intensity Series on VHS and adding either Rthymic Step or Imax. I've heard that Imax is harder than Imax2 (which I will be ordering) and that Rythmic Step is difficult to follow at first but fun. Is Rythmic Step at all like Step Works? My other option was getting Power Hour or PS:Strong Legs. I don't know much about these videos. Thanks for your input.