After having a window well wash out because of overflowing gutters I knew I had to do something. After looking at 5 or 6 different types of gutter guards I chose Rhino Shield and I'm glad I did. They've worked flawlessly since day one and now I have one less thing to worry about. Interesting that many of the other companies I talked to told me that installing gutters guards under the shingles would void the shingle warranty. The Master Shield rep showed me letters from all the major shingle manufacturers that said it didn't. They were lying to me, Master Shield didn't and I'm glad I chose them.