Hi-
I am a huge fan of 6 day splits!! This is the way I normally train as my standard way for weight work and have been for years.
For me, I love being able to only focus on one bodypart/day and completely exhausting it.
The downside is that you have to commit to 6 days of strength training, which isn't always easy to do if you don't have a schedule that can work it.
I don't have STS, but have done a 6 day split with Slow and Heavy and also w/ Gym Styles.
I would do one bodypart from the DVD and then add on some cardio... It worked great!
Take care, Lynn M.