I just did it, and it wasn't as hard as it looked, certainly no comparison to Meaner Legs, at least not done with the weight Cathe is using. I had a tough time with the explosive lunges, and with the last side lift thing for the outer thighs, where I had to drop the ankle weight to get that last set of eight. I do feel that it was worthwhile and tough, but not in the same league as Leaner Legs or PS Legs, maybe even not as tough as PLB, although maybe if I raise the weight. It was my first try, after all.
My uneducated opinion at this point is that it would be great as a second leg workout in a week, and I'm definitely going to raise the weight next time and see how my quads feel.
A fun and worthwhile workout though. The floor work was plenty tough, lots of variety. I like it, but need to beef up the quad work.