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Bad idea. Compressing air takes a lot of energy. And we know from the first law of thermodynamics the energy output of a system can not be higher than the energy put into the system. And because these cars use the compressed air as a propellant (as opposed to a fuel) we already know that the amount of energy put into compressing the air will be significantly more than the energy that will be put to the road. When you throw in the efficiencies of the entire drivetrain and wind resistence etc... I'd bet that you don't come out much above the 20% energy throughput that an ICE gets. Heck in all reality you'd be ahead if you cut out the air compressor and just used the motor that drives the compressor to drive your car.
If you're looking to save money because running the air compressor at your house is cheaper than filling it with gasoline that's a good car to look into. Just don't be fooled into believing that they are better for the environment than a properly tuned gas or diesel ICE.
My $.02
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