I've read about these. Its good that you don't have to worry about a tire going flat, but you will feel every bump in the road since there is no cushion of air to ride on. Also the aerodynamics of the "tweel" are not as good as a closed version.

A better idea is to integrate the two types of tires(air and airless) so you have the benefits of both tires. Don't have to worry about a flat or getting a massage when your driving.

My ride(Cardomain link) : '95 Contour 16V Zetec DOHC, Teal , ATX Born on Sep. 4, 1995 86+ miles *LEDs mods are on their way!*