Anything made entirely of plastic lasts maybe 5 years. Not of them stop small particles and often get jammed up. The smaller the holes the less they let the gutter actually do its job during heavy downpours.

My suggestion is some combination of; buy some of the gutter spraying wands, cut down your trees, remove all unnecessary gutters, or hire a handyman once a year.

If you want the best gutter guards they're made exclusively of metal and are pretty much expanded metal

https://m.guttersupply.com/p-gutter-...e-hinged.gstml
https://m.guttersupply.com/p-gutter-...-lock-on.gstml