Any product that is capable of allowing enough debris into a gutter, to potentially clog it, doesn’t work. (If work is defined as giving you complete confidence that your gutter won’t overflow, due to a clog). We don’t believe the Gutter Helmet gutter protection can assure that a clogged gutter will never happen to you. Gutter Helmet offers a lifetime service warranty. In the event that your gutter clogs, Gutter Helmet relies on dealers to come and unclog your gutters “first chance they get” and (we assume) as often as necessary when your gutter clogs.'Gutter Helmet' is a registered trademark of Southeastern Metals Mfg Co., Inc.