I hate to be a spoilsport, since I love anything unicycle related, but http://www.google.com/patents/about?id=im-cAAAAEBAJ&dq=unicycle is an example of this idea done six years ago.
For more outlandish unicycle training methods, see also http://www.google.com/patents/about?id=ahsCAAAAEBAJ&dq=unicycle and http://www.google.com/patents/about?id=Hdc5AAAAEBAJ&dq=unicycle.
Also, I haven't checked your inventor's website, since I'm at work (guess what my job is?) but I suspect it may not work that well, since you need to lean forward a little to go forward. Of course, the wheels aren't exactly on the ground, allowing a little lean, so I'd have to see it in action to know.
For more outlandish unicycle training methods, see also http://www.google.com/patents/about?id=ahsCAAAAEBAJ&dq=unicycle and http://www.google.com/patents/about?id=Hdc5AAAAEBAJ&dq=unicycle.
Also, I haven't checked your inventor's website, since I'm at work (guess what my job is?) but I suspect it may not work that well, since you need to lean forward a little to go forward. Of course, the wheels aren't exactly on the ground, allowing a little lean, so I'd have to see it in action to know.