Well, they are talking about water efficiency. Since it uses a smaller diameter tube, water will flow more slowly, so I suspect that 300% less water does not mean 300% faster cooling. Rather, since it is smaller tubing the water is closer to wort temp when it exits. This would get the most cooling per gallon, but you could do the same by just slowing the flow through another chiller. All of that turning probably does create turbulence in the cooling water, which might help too. Overall, though, I'd say many homebrewers are more concerned about time than water use. It is pretty though.