I had the unique opportunity to try the prototypes of the abovementioned personal transporters. The Winglet is similar to the Segway, yet smaller, made with much more plastic, and with a slightly different steering system. The Uni-cub is targeted towards indoor transport, such as for the elderly, and you move by shifting your weight, similar to the Segway again, but in the sitting position. Enjoy the videos.
Riding the Toyota Winglet
Auri's Blog 
Awesome videos! I wish they would put the winglets into production so we can all enjoy them;) maybe one day…