A.J.
I have it. Very difficult, but yes, very effective if you use it! My only beef is that I don't love the style of the dance aerobics (various workouts included, some are dance aerobics), but the straight up butt exercises are super good. I use it in rotation with other DVDS and work outs, because it does pretty much focus only on the butt. It's sold by Beachbody, who also does lots of other work outs (I love their Turbo Jam ones) and is very reputable.