I would not recommend them OVER Cathe's, but as a complement if you like to try a variety of styles. I second the opinion on Franny Benedetto. She comes the closest to Cathe in terms of intensity. The other instructors are hit & miss, IMHO, some good, some not so good. The best ones seem to end up eventually going out on their own (our own Cathe did her first video with Greg Twombly of CIA...I'd sure love to see a clip of that!)
Leslie