the sales person at marvin is very nice and attentive. he really took the time to find standard sized windows that would work in our home. ordering standard sizes saves money. he made sure that the order was in on time so that they would be delivered at the right time for our build. we had a hard time with the installation. the people from marvin came to our jobsite to consult with the installers and make sure that the windows went in right. we love our windows and would never go with anybody else.