Has anyone had this particular gutter leaf protection installed? I have seen many posts on the other systems but not Guttershell - it is an aluminum double-drop system, with the edge placed under the shingles. The company told me they usually nail it under the shingle every 2 1/2 feet, but could use less nails, that is, every 5 feet, but am leery of any nails on the roof. Also had a question on rain overshoot - do you have that problem? Does it keep leaves out? I have a locust tree (small leaves) in front of the house. Any experiences, good or bad, would be extremely helpful. Thank you!