This customer had foam inserts installed in their gutters, which are horrible. They restrict flow and hold dirt and mud in the gutters for long periods. After installation, like most customers, they ignored their gutters. This is the worst thing you can do. No matter what you cover your gutters with, you will need to check them from time to time. If you can get away with cleaning your gutters once a year or two, that is all you should expect from the best of screens.