You can divide all gutter protection systems into three groups: screens, gutter covers, and full replacement systems.
Screens will always clog! No matter how small the openings, roof gravel, decaying leaves, tree sap, pine needles, and the like will clog the openings on a horizontal screen product. Some of the newer micro mesh products claim that if your gutters clog they will give you your money back…because the gutters aren’t going to clog, the screen will. Screens need maintenance, and isn’t that why you are purchasing this system in the first place, to avoid maintenance?
Gutter covers are generally made of weak aluminum stock that is pretty much unsupported. Anything that falls on these weak pieces, like large seeds, branches, balls, etc., dent, breaks off and damages the covers. Gutter covers also attach to your roof, and many of them actually screw into the roof decking. Interference with roof shingles can cause the shingle tabs to break or become weakened and can void roof warranties. Screwing into roof decking can lead to rotted wood and interior leaking.
There are basically three full replacement systems. Leafguard is a one-piece system, which means if any part of the leafguard is damaged, the entire system has to be replaced. The Leafguard is also smaller than a conventional 5-inch gutter and is unusual looking. The trough of this system is also unsupported and can lead to an uneven opening as well as an opening that is enlarged to let in excessive debris. The second full system is Gutter Maxx, which is a nice system, except that it has an opening at the back of the system that can become clogged and the hood only snaps on. Anything that snaps on can also snap off. The other thing about this system is it has a very unconventional look and has a boxy appearance.
Gutter Shutter, however, is the strongest system on the market. It is made of the thickest aluminum stock that can be extruded through a gutter-making machine. Its brackets fully support the hood and the trough to create an even, consistent opening down the entire system. The brackets are made of strong, temperature-resistant nylon and are attached to your home with 2 three inch screws every 2 feet for extra strength against pulling away. The system is available in a true 5″ and an over-sized 6″ version to work on any size, type, or pitch of the roof. And finally, the Gutter Shutter looks like an improved conventional gutter. Like crown molding in a higher-end home, the Gutter Shutter frames your eaves and adds curb appeal to your home. The Gutter Shutter is backed by a lifetime no-clog warranty and is installed by the foremost authority on gutters and gutter protection, Gutter Shutter of Chicago.