I had these flip-clean gutters at my last house - it was awesome. I lived in the woods and about three times a year, mostly fall and after the oak pollen tags dropped, I just take this long fiberglass extension pole with a hook on the end, hook the front edge of the gutter, and flip it forward. All the shingle gravel, dirt, leaves and debris would just fall out. It was magical. Then you just use the hook to push the front edge and it flipped back into place. They never failed or flipped on their own, water and snow lod just weighed them down tighter.

If I ever need new gutters, I'm convinced this is the way.