Caged Fury was a rather underwhelming movie. I'm a novice when it comes to "women in prison" movies, but this movie wasn't worth watching, even for free (thank you Amazon Instant Video for making this free for Prime members). Yes, there's a good amount of bare female butts and breasts, and some nasty gore scenes, but I found myself bored most of the time.
Unless if you're tanked up on booze, don't bother watching this.