I got a Spinervals DVD today (1.0) and tried it out (and my husband finally got a trainer also which came with one). It was a tough workout for sure, and I was huffing and puffing trying to keep up. I was having a difficult time going into my big gear up front so I have to check on that before doing it again, and they definitely have you switching gears a lot, at least in this one. I did like that they were outdoors and were from different backgrounds.
Looking forward to trying more. My library is now up to 3 - 1 CTS, 2 spinervals. At least there is some variety there.