Check out the Solowheel.
I saw one fly past me in London on my way to work yesterday. It was even more impressive and jaw dropping than the Twizy, and I instantly wanted one! 
That’s one of the most interesting things I’ve seen in a while.
Very tempted 
I’ve seen video clips of the Solowheel before but I have never seen one in the flesh. It looks great fun, but I bet you it’s not easy to ride. Those riders in the video are experts and they make it look so cool!!
The guy I saw on it seemed to be doing pretty well. I suspect it’s easier than it looks due to the gyroscope
Seriously considering buying one of these, it looks like great fun. Absolutely no idea what I would use it for though. Looks to be about £1450 at current exchange rate
I would love one, but can’t justify spending that sort of money on what essentially would be a toy. I don’t have much practical use for it!