Dad had gutter guards of some sort installed on his house. Good thing they came with a lifetime warranty. He had those guys out one or twice every year to clean out the gutters. I guess you could call it a lifetime gutter cleaning contract.
The guards were designed to use surface tension to "roll" water over the edge into the gutter, but send debris over the edge to the ground. It may have worked with heavy rain and "high speed" water. Fir trees and Pacific Northwest drizzle predominate in his area. With the light drizzle, the needles just rolled over the gutter guard edge into the gutter. Totally ineffective. Topping that, the guards made cleaning the gutters a real chore. Like I said, the guarrantee was well-used.
I expect the situation would be different with deciduous trees. Conifers, drizzle and gutter guards don't mix, in my humble opinion.
The guards were designed to use surface tension to "roll" water over the edge into the gutter, but send debris over the edge to the ground. It may have worked with heavy rain and "high speed" water. Fir trees and Pacific Northwest drizzle predominate in his area. With the light drizzle, the needles just rolled over the gutter guard edge into the gutter. Totally ineffective. Topping that, the guards made cleaning the gutters a real chore. Like I said, the guarrantee was well-used.
I expect the situation would be different with deciduous trees. Conifers, drizzle and gutter guards don't mix, in my humble opinion.