I don't use the leg workout much either. First of all, I need 75 lbs to really make it tough, and that is a pain to take on and off the vest for the "pre-exhaust" exercises. And there is not floor work. Oh, I dont know, I just dont' like it much! Sometimes I can't pinpoint the reason. But I use the upper body stuff a lot. Sometimes I add one body part on to a cardio day every day of the week, doing two body parts in a day if I am resting my legs that day. I then do an endurance workout like ME or PH another day of the same week to get my "two workouts per body part per week" rule followed.
I don't really do rotations, but I use S/H once or twice a month. It is really excellent for building strength and teaching good form.