Carolyn,
Besides the annoying choppiness, the fit tv version cuts out part of the first step portion, the entire first interval, and the entire last interval. If you have those portions on the terminator then you know what they're like, so you'll know if you like them or not. I also had the fit tv version of IMAX2 for a long time, but couldn't wait to get the whole version for continuity, flow, and ease of just popping in that workout and knowing I'm getting the whole she-bang. Also, if you get the DVD the premixes rock and can really up the intensity level as you progress.
Hope this helps,
Mattea