Um I did the first week and even though the 5 sec eccentric were a nightmare, the high stress is even harder yeah because it's 6 reps + 24 lunges + 25 legs extensions. The giant set is like 90 seconds of TUT... Plus I had never done leg extensions before (bad knees) but since it was a set of 25 well the weight would be very low. I had never felt my quads like this before, this sessions was so hard I had tears in my eyes.
I advice for the big exercise you start with around 70% of your max.
Anyway I love it, it's a nice break from powerlifting training, and I am more pumped and striated than ever...
But yeah it's the hardest thing I have done. It's good though, you have to be insane sometimes to remember what really hard work is