I decided last fall that I was doing something different this year. I've asked a lot of people about what they have and their experiences, etc. Gutter helmet and Leaffilter customers are happy but most still have to wash them out occasionally. Leaves are my big problem so I've ordered snap in metal screens and will just install myself for a little over a buck per foot.
The Leaffilter customer I talked to said that wet leaves would stick to it sometimes and he would clean them off with a blower.