I have just entered complaint dialogue with Gutter Pro regarding their 4 seasons product. Their product information stated that gutters would be thoroughly cleaned prior to installation. i had a MAJOR leak into the ceiling and down walls after installation.
A licensed roof repairer lifted a section of he gutter guard and found leaf debris, dirt and a piece of a scrap metal blocking the water pathway. All documented with photos. A small section of ceiling will need to be replaced.
Will keep you posted on how it goes.