Hi Lisa,
If you are talking about the compilation DVDs, here's my experience.
Terminator- I used the Imax Extreme title some. The others were circiut workouts and I just don't do this type of workout as much as straight strength or pure cardio. I've read a lot of posts about people liking this DVD. Hopefully, you will hear from them.
Timesaver- I use when I am short on time or have a hectic schedule. This DVD is like CTX but easier. The workouts are not original as in CTX. They are compilations from BB series. The Cardio is not as high impact. The weight work has some original footage. I have used this more than the Terminator. I read where some people didn't use it because they had the BB series. I did use both. I also used it when I had a BB workout that I needed to sub, due to time or DOMS. There is no upper body split chapter on this DVD.
Hardcore Extreme-I didn't think I would use this too much. But, now that I have it, I think these have a place in my schedule. It is chaptered nicely and can be shortened. There is a circuit workout and two interval cardio workouts.
Hope this helps,
jordan