I used this for a large window in my kitchen. It was very easy to install. I purchased this one because it was rated commercial use and thought it would be less likely to bow in the middle. (From side to side the extension is 108"). We were trying to avoid any holes in the wall or cabinets. It bows slightly in the middle but not too obvious. A conduit clamp fixed that problem. Just felt it was a little expensive at almost $92