It seems to be very similar in principle with the Alcoa Leaf Relief, but with the advantage that the guard seems to be flush with the outside gutter lip, so that leaves can blow off. With the Leaf Relief, it sits inside the gutter, and there is the gutter lip that would prevent any leaves or debris from blowing off. Other than that, the two products seem very similar. Any experiences? I was thinking of installing Guttershell (a reverse curve hood with two sets of holes), but am having 2nd thoughs.