I have an inexpensive dvd/vcr commbo and never had any problem with a 1-2 second freeze, but even if I did, I would prefer it to the time it would take to go from one dvd to another.
It seems we won't be getting any answer to these posts from Cathe about this. With so many people on this and other posts saying how disappointed they would be if gym-style workout is not on one dvd, I do wish Cathe would answer us and perhaps reconsider changing the decision, if one has already been made.