Lotsa people will probably just say gear your car right. But the truth is, there is no such thing as too cold with electronics. Ok, there is, but lets not get too technical. Cooler just means run stronger and longer.
It seems like a good idea. Water cooling has proven to be a good cooling solution in just about every situation, why not in RC? This system seems light enough and small enough. Only drawback I see is price. There does not seem like enough data and/or proven data for me to drop $200 on it. With as long as it has been out, I would figure if it was worth it you would hear and see more about it. I'd also expect other companies to come out with their version. Neither of which seems to be happening.
Unless I see proven performance or get it for free, I wouldn't.
*Photon* *SC10 4x4*