I had Leaf Guard gutters installed for 7 years. It is a nice looking gutter, but I found the system was unable to handle heavy rain (the demonstrations in Costco or other stores do not allow an increase in the rain rate, less they demonstrate this over flow problem).
The overflow caused damage to plants and grounds; eventually the system clogged with trapped debris and tilted to prevent flow to the drains adding to overflow problem. I was unable to obtain a response from installer or company.
I kept getting run around from representatives, but understood original installer company in Maryland was no longer in business. The warranty was therefore worthless, and eventually I replaced the entire system with conventional gutters and screens.
Monetary Loss: $450.