I have had experience with the so called Gutter Filter sponge products. They seem to be a decent product for a short term solution, but not for the long term. The first thing that I noticed is how the sun eats away at the product. No matter how much they dip their plastic in UV inhibitors, the sun will win the battle long term. Also, they are total debris traps when it comes to the spring time debris. Leaves can get trapped on it, as well as pine needles. If you don't have good air circulation around your house expect to get up there and clean off the tops. I removed a section that had been up there for a year, and the bottom of the gutter was coated in muck, just like it does when it's open. Who ever pays a lot of money for these types of gutter guards is foolish as they are a do it yourself type system. I'm sure the guys here saying how great they are, are just selling them. Oh by the way, something they don't tell you is how they retain moisture for several days after it stops raining. I'm sure it's a matter of when the built in biocides wash out and mold and mildew starts......
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