I did this workout for 4 weeks last summer when I was looking for some exercise I could do in the heat without passing out (no air conditioning in my place). I'm very physically fit to begin with, my routine for years has been a combination of exercise bike, weight lifting and Jillian Michaels. This dvd is really not a challenge and is definitely not worth bothering with.
There is no instruction from Ms. Anderson regarding correct form or technique. This is a serious problem. Adding to her lack of communication is the fact that the workout is shot from one angle making is almost impossible at times to see what she's actually doing because of how/where she's standing. The arm workout is a waste of time. The standing ab portion is absurd. The standing leg workout eventually led me to quit due to the back problems it gave me. It's incredibly tedious and after a few days I muted it (might as well, like I mentioned before, she says almost nothing) and just played my own music.
There's really nothing new about her "Method". The various leg lifts, etc. she does are as old as the hills. She's said a lot of ridiculous things in the media and visually she's a bit disturbing to look at (think Kira from The Dark Crystal in workout gear) and the fact that Gwyneth Paltrow is a believer is more worrying than convincing. Why would anyone follow the diet and exercise routine of a woman who's basically admitted she's given herself osteoporosis before the age of 40?
I've since discovered Mary Helen Bowers, Ballet Beautiful, which I do recommend. It's basically the same sort of light exercise only it's a real back saver as they're not done standing (and she actually speaks and gives instruction, how novel ! )