I have installed several Anderson products and always found them to be of great quality. I am currently in the process of replacing the sliders and windows in my house and have been doing some investigations. I have looked at many manufacturers and have come to a single conclusion, if the demo at the store, being abused as it is, and not really representative of an actual installation, and still functions well it is probably a good unit. Do not rely on the sales people at stores like Lowes and Home Depot! DO YOU'RE HOMEWORK! Most manufacturers have websites that list all of their specifications and a lot of models that the local stores may not stock.