used it
I skipped 15's and went 2 weeks x 10 reps and 2 weeks x 5 reps. Didn't gain a pound, but strength busted through plateu. The key is to start very light and progressively add poundages until you get to your old plateu. Also limit number of sets because my training partner overtrained very easily when he chose to do 5 sets instead of 2 sets of maximum effort every workout.
Strenght gains were this:
Lat Pulldown from 190x10 to 230 x 5
Squat from 200 x 10 to 225 x 9
Incline bench from 155 x 10 to 190 x 5
Cable row from 170 x 5 to 200 x 10
I tried the program again, and it didn't work 2nd time... I am doing one bodypart/day now and when I'll stop seeing results from it, I will again switch to HST. Great program