We purchased 10 new windows for our home in Phoenix. The sales person was very knowledgeable both about their product and the competition. I was able to make a very informed decision in the purchase of our windows. The installation staff was courteous, professional and went out of their way to make sure everything was done correctly. Any questions we had were always answered promptly. The product is awesome. We noticed the difference immediately after installation. The rooms in our home facing the hot Phoenix sun were noticeably cooler after installation of the new windows. IMHO I believe the windows actually insulate better than my walls! Overall I could not be more please with the product and the sales and installation of the people at Desert King Windows. I would certainly use them again and recommend them highly.