A must have are access ports on all of the wheel covers where you can add Air to the tires.
Also something else I have been concerned about. With the wheels sticking out from the body, Are other drivers going to take a wheel out when they overtake you. You get used to how close you can get to another car in traffic. Someone might not see your wheel, obstructed by their hood ? Then just run into it.
There is a better solution, and it looks like Michelin is the trying to bring it to market with chevy. I saw this design (initially created by some inner city kids and documented on Scientific American Frontiers). The original design was using cuts from old tires as the spokes and wrapping the entire structure with new rubber over the skeleton.
I would prefer to see something like this as a solution. Much less wasteful and considerably more reliable.