I've had them for about 4-5 years. No problems at all. I haven't cleaned gutters in decades - but it is nice not to have to pay someone to do it.
I used a local guy not the one that advertises all the time. I have a one story home that is just under 3000 sq. ft. I think it was about $1000 - but that also included some gutter repair work.
The last time I cleaned gutters was in the early 80s. I spent a day on a ladder hauling the most disgusting muck out of the gutters. I was filthy. Literally just a mud ball. It was one of the worst experiences I've ever had.
About a week later my yard man told me that he would clean the gutters for $15. I could not believe what I'd been thru to save FIFTEEN DOLLARS.