Honda has designed and demonstrated a new unicycle that is similar to the Segway for people who want to sit down instead of stand up. The design is impressive in how it works, simplicity of use, and compactness. What remains to be seen is how much it costs, when it will be available, and whether they can increase the battery life beyond the one hour currently specified. As a benchmark the Segway X2 has a range of 19 km and a top speed (20km/h) that is twice that of the Honda unicycle. Prices for different models of Segway vary but are approximately in the range of $5,000 to $7,000.
Although this is an amazing engineering achievement one comment is how necessary is it to solve this problem given that most people could benefit with some exercise walking.