I liked it better than her other KB workouts when it first came out (I don't like her putting more choreographed non-kickboxy stuff in, and with her first KB workout, some of the moves were so awkward to do correctly).
I REALLY like the bag section (which is too short, though). It's a nice sequence of moves that are really kickboxy (not like the short segment on one of her earlier KB workouts, where she does tuck jumps after doing a punch, for example). It's excellent if you have a bag to use for it. (I don't think you'd get as much out of it without the bag.
That being said, I don't reach for this workout very much at all. It's rather dull, IMO. I think Amy took things a bit too much in the opposite direction of her other KB workouts, and the build=up to sequences is kind of slow.