Slim in 6 feedback

Options
I have just ordered the Slim in 6 program. I have the P90X program that I used last year but have had a back injury since then. My back is much better now that I am exercising again but I am reluctant to go back to the extreme workouts in P90X and the Slim in 6 seems like it wouldnt be as intense...any feedback from anyone who has used it?

Thanks