Bests & Worsts Reviews from Amazon

We purchased this product to try to be more "green" about our water usage. While the product should be able to do what it states, it is going back tomorrow. After installing it, we were getting hot water in the cold water line (despite running the valve test they recommend in the manual). After waiting on hold for awhile, I reached someone who explained that if we had single handled faucets from any of a few manufactures the system would not work. They explained that these faucets would let water flow from the hot to the cold side when the pressure was raised on the hot water supply (which is how this system works). The only fix is to replace a part in the faucet (if available) or replace the faucet. Since this affects six faucets in our house that are too old to get new parts, we are done. I have no problem with this restriction, but it is not listed ANYWHERE, including their web site and instructions. Given that I now have a piece missing from my hot water supply line, it is a little late to tell me now. I give the product an `A' for what it will do, but I give the company an `F' for their documentation and lack of disclosure of a major problem. This is too major (and common) and issue to not tell people about up-front. I feel mislead by Watts.