Hi,
I guess I am the "guilty" one that had the promo code.. anyway, I also have #6 and like it because it is split into 2 30 minute sessions, so you can do either 30 or 60 minutes.
I love I-Treads! The site is itrain.com. Skip the intro ( corny!) and go to the I-tread section on the left hand side. The newest ones will be on the page and down in the right hand corner it sas "additional workouts". This opens a window of all the I-treads.
HTH
Deb