I beg to differ with you. I am a home improvement contractor that has installed Leaf Relief for the last three years without a complaint. I have over 15,000' installed on homes; in that three year period; or about 1000 homes. Frankly; I have tore off your product on some homes to replace it with Leaf Relief because the homeowner I encountered was not happy with the Elko system. Leaf Relief can be installed for just a little over what you claim your product can be installed for and it comes with a no clog guarantee from Alcoa which I don't believe you offer (correct me if I'm wrong). Yes; some debri can lay on top of the product but we've never had a problem with a clog...not one. Why would a big corporation like Alcoa put their name behind it (Leaf Relief) if it didn't work? Nor would I continue to install Leaf Relief if it didn't work or if I was getting complaints! Just setting the record straight.