Hello Dogonyx,
I started with VHS then broke down and bought a DVD player JUST so I could get Cathe on DVD.
The DVD is SOOOO much easier to use. With Cathe you can mix and match so much that you can create your own workouts. The DVD really makes that possible.
When I had the tapes I would find myself queing up the tapes the night before so I could start my workout with (for example) CTX kickbox, then stop at the end of the cardio section, and do the weight work for triceps from the other ctx tape then switch back to the first tape and etc.
Now its just instantly go to the section I want and go back to wherever. None of the awful rewinding either. The dvd also makes it easier to skip to the different sections (routines) of the step workouts so if you are doing, say, step works, and you're pretty good at the first section, with a dvd you can do the warm up and skip to the second or the third and learn that part without either doing the first part or fastforwarding.
I have found ONE disadvantage. Once, while doing cardio kicks, my power went out. I was in the cardio section. With a tape, the tape would have mechanically stopped at the point I was at. But with the DVD, I had to forward through the workout to get back to the point where the power went out. However, it was only THAT section (chapter?) of the DVD and NOT the entire thing.
GET the DVD's. Get them ALL!
-joy