I think the A/C cooled intake charge is a great idea. But as Ross stated, there is no free lunch. You have to pay for it sometime, somewhere. However, for drag racing it is great as you can get the benefits for a short period of time, i.e. the quarter mile, then pay for it later when you don't need maximum power, as your car is idling along afterwards on the return road or cooling down in the pits.
paul