DS would like a unicycle for his 12th birthday. They're about £30 on ebay. He's a good cyclist, and has good balance on stilts etc, but he's never tried a unicycle. I don't know anyone who has one who could let him have a shot to try it out, so I've no idea whether he'd get the hang of it and enjoy it, or if it would be so hard he'd give up. (He's not known for his perseverence.) Does anyone know anything about unicycling?