We used Alside's replacement windows in our entire house. Within two months one window just cracked with no apparent reason. They replaced that under the life time warranty. Six months after it was replaced another window cracked. I contacted them again and their reply was that the glass was not covered. Since glass is the biggest component of a window the warranty is basically useless. I believe that they are using an inferior glass and selling "lifetime" warranties with no intention of living up to their promises. I replaced my origninal(20 year old) windows that were basically sound but required maintenence, and I now am stuck with repairing "new" windows. Their literature says that buy Climateck windows "and enjoy the fact that you have made a wise investment in your home." In this case I am extremely sorry I bought a product that was "Made in the U.S." and I feel that my money was wasted.