Has anyone had any experience with the P90X workout plan? I was naturally immediately suspicious of it because it is sold in an infomercial, but I have two not-at-all-crazy friends who have used it and swear it works, and there are pretty positive reviews online. The caveat seems to be that you have to have the stones to stick with it, which is true of pretty much any program. The concept appeals to me because it's not expensive and you can do it at home with no equipment other than a resistance band and some dumbbells.
Anyone have an opinion?