Has anybody used this? It's a two-door weir that has curved doors, and they claim upwards of 100 dollars in energy savings per year. I'm assuming the savings come from reduced pump run time because of how the system works. The weir is supposed to increase the velocity of the water entering the skimmer because of a reduction in pressure, kind of like a whirlpool...(Bernoulli's principle), in turn giving you a faster turnover rate. Is this another too-good-to-be-true product?