The most common complaint about GutterBrush in customer reviews on Amazon.com is that small leaves, needles and seeds get caught in the bristles. Customers complain that the build-up of debris clogs the flow of water through the brush.
Some customers on Amazon.com complain that falling maple seeds get stuck in the bristles of the GutterBrush and eventually start to grow. Other users mention that small pieces of debris slip under the brush and prevent water from flowing. Many reviewers complain about the time it takes to clean the GutterBrush, saying that it takes longer to clean than the gutters themselves.