My DH ordered all three DVD's without telling me (usually I'm the one ordering workout DVD's without telling him!) but I have yet to watch/try them. He's done the core one a couple of times but he said he couldn't complete it (no suprise as he has a very weak core). He really, really likes the stretching workout. I actually hope to preview these tonight, so I'll let you know what I think.
They came highly recommended by a number of cycling enthusiasts.