The Maker recently bought a Ripstik with some money he got for Christmas. (Got a great deal for a practically brand new one on Craigslist, w00t!) It took him a little while to get the hang of it, but he's gotten pretty good as you can see from this video.
Download The Maker rocks the Ripstik
For the record, I have not attempted to ride the Ripstik myself and have no plans to do so.
[Also for the record, this is the first time I tried uploading my own video to my WordPress site and I'm not really crazy about how it turned out. I'm thinking I may have to go with some outside video host (e.g., YouTube) to store my videos and just embed them here. Feel free to offer suggestions in the comments.]