Yes, I would consider it low impact, high intensity. But, there are kicking drills which I'm not sure are too knee friendly.
It does not have near the quality of Cathe either in filming or choreography. The only reason I mention this is because up to this point, I have been using Cathe almost exclusively, with a little TAE BO from time to time so I was not prepared when I switched on this video. First of all, it had some tracking problems DH was able to fix, thank goodness. It's also a little slow in the beginning compared what I'm used to. But once I got into it, I enjoyed the workout, even though there is a lot of repetition.
The form of the instructors is wonderful. One of the instructors is European, sounds either Dutch or German. Love her accent. I think I paid $22 with shipping.
The simple answer is, if your knees and feet can tolerate Cathe's KP&C, they will be able to tolerate this workout.
Sorry I went on and on but sometimes I hate to leave out details that I think may be important.