Replacement-windows.com is a good place to find customer reviews of Ply Gem Windows. Replacementwindowsreview.co is another website that provides reviews from contractors as well as customers.
Customer reviews of Ply Gem Windows average at three out of five stars according to replacement-windows.com. Most reviews say that the windows are good quality, but the Ply Gem customer service and warranty were not satisfactory. Replacementwindowsreview.co goes into more detail and describes Ply Gem as a midgrade window available in three vinyl window options. It also states that Ply Gem Windows is a large company that mainly sells in bulk to contractors, and its windows are generally a good buy when priced appropriately.