Hi Olivia -- maybe after STS comes out and you can see some of the clips, etc., you might reconsider. I have been working out to Cathe since the early 1990's (at that time it was step) and I absolutely love everything she does. I do, however, have to modify things from time to time (I'm currently 43 -- about 4 months younger than Cathe!), but her workouts have produced excellent results for me. After I got married in 1987 and had my first child in 1989, I slacked off and gained about 30 pounds. I didn't work out as much and was very out of shape. About 5 years ago, I got real serious again (mostly with Cathe) and have seen wonderful results. I've lost all of the weight I had gained, plus I have obtained great muscle tone, etc. I actually feel like I'm in the best shape I've ever been. On a lot of Cathe's tapes (weight, step, kick box, etc.), I have to modify from time to time because as I get older, I just can't do the things I did 20 years ago (some of the moves I could NEVER do!). But they are still wonderful in my opinion -- maybe you'll change your mind, but if you don't, I can certainly understand!
I guess the main thing is that we just keep working out to whatever makes us happy and produces results!