After subjecting 11 of the most well known household names for gutter guard protection to a 24 month rigorous test, NCR Protection Product Reviews submitted the following: Water flow through testing, Durability, UV Damage (as would happen from sun rays), Sediment flow through rates, Accelerated weathering, Clogging due to mold, leaves, shingle grit, and dirt. NCR is pleased to announce that after being brutalized for 24 straight months by whatever extreme and destructive tests imaginable, the one gutter guard cover that surpassed ALL of the other gutter guard covers and stands alone in performance, price and value is GutterDome Gutter Guard. GutterDOme Great Lakes provides a Limited Lifetime Transferable Warranty on both product and service.