I have one. I've used it twice, bought it in June.
Now, that doesn't mean I don't think it works... I like the jumproping action, I'm a klutz and would kill myself on a jump rope. I actually simulate the jumproping movement as part of my warm up to my kickboxing, just don't use the jump snap when I do it.
The video with it seems kind of goofy to me, but I've gotten more into videos since then so I might retry it. I do know I get bored with activities, so 30 minutes of jump snap would make me crazy.