Excellent windows and they stand by their product. I needed one replaced due to a small cosmetic defect and had no problems getting it replaced. I've gone through a tough winter and noticed a huge decrease in our electric and gas bill. They showed us with a heater how efficient the windows are and we were impressed. We are still impressed.

Double hung southern rose 3x3 windows. The company does not stand behind their product. Unfortunately, I have had a bad experience with an entire lot of windows in our home that is less than 4 years old. The entire house contains MGMs windows. We have 3 3x3 windows and all of them have leaked during light to heavy rain. One was reinstalled by a professional contractor and has continued to leak. Calm talks with MGM have led nowhere. They were on the defensive from the beginning stating they test their windows and can not attest to if they were installed correctly. Based on these issues, I can not recommend this manufacturer for any new construction homes.