I've done both the Circuit 1 and the Circuit 2 premix on this video, but not the weight work alone
Circuit 1 is heavier on the quads - it uses Combo's 1-3 mixed up. The circuits are a combo (or combined 1 & 2), Slo Mo Legs, Slo Mo Upper Body. It does that 4 times, then there's a final combo followed by Tri's and Bi's. This one fried my legs!
Circuit 2 uses combos - 3 and 4 and the Power Ups. It's seems to be heavier on the hamstrings. And a bit of a better upper body workout.
As I want hard cardio followed and heavy leg work, this is great for me. I think they are both light on the upper body. But, I will say, they are both CALORIE burners! If I remember correctly, on the second one it starts with combo 4, then goes to hack squats and hammie rockers, THEN it goes to combo 3 - with all the squats and flying over the step. That was a challenge after the squats and rockers! But man it was fun.