I did Low Max early this morning. I really liked it, but was surprised that it bothered my knees a bit. I usually don't have too much trouble with my knees, even during very high impact moves thanks to glucosamine), but I could feel twinges in my knees during several sections of this workout. There were a lot of squat and lunge movements which I think caused the problem, but I think using a 6 inch step for some of the intervals, rather than 8, would help to eliminate the discomfort.
Shelbygirl