Nice, but it's just for kids.
http://www.thegyrobike.com/faq-s/38.htm
CAN I USE THE 12 INCH OR 16 INCH KIDS' GYROWHEEL ON A FOLDING BIKE OR RECUMBENT BIKE?
No, 12 inch and 16 inch kid's Gyrowheel are designed for 12 inch and 16 inch kids' bikes respectively and to accommodate the height and weight specifications of these kids’ bike sizes. Gyrowheel should not be used in any other manor – alone or in conjunction with another device.
Here's another (classic) approach:
http://www.recodrive.eu/docs/33/flyer_de.pdf