I like Skyline Windows' product and installation. I think they have a good supplier and a good manufacturer. I checked that out in a lot of detail. They weren't the cheapest, but I felt like they were the best over all, and their prices were very competitive.
As far as installation details, I'm very concerned about water and seepage around the covering. They did an excellent job sealing all of that. Their product and the installation details are why I gave them the ratings I did.
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