This is a great product that has proved to be a total success in our situation and our only wish is that we had come across Gutter Foam years earlier. Super easy to install, the product has worked for all offending leaf types and reduced my maintenance to the occasional brush off the top when the larger leaves sitting on the top appear unsightly. The product has not deteriorated in any way and looks like it did when first installed.
Living in the bush in the Waitakere Ranges our house is dominated by large Rimu, Kanuka and Rewa. All differing leaf structures they presented the same problem in different ways where no one solution appeared to work for all three leaf types.
We tried a brush / whisker type of gutter protection. The Rimu got caught in the whiskers and the Ti-Tree leaf found its way through the whiskers. The result was more work cleaning out the whiskers than it was cleaning out the gutters on a regular basis. It became clear we had to scrap the whiskers style of gutter protection.