Hover Mouse

This thing looks really cool, but is it just a gimmick? The claim is that it is a 100% frictionless mouse that hovers over the mouse pad by about 1 cm. The pictures on the site show the mouse hovering but do not show how it works when someone is resting their hand on it. Will it still float?

Although this looks cool, I'll wait to see some reliable industry hardware reviews before putting down my cash on this one!