So I got a quote for Okna 500 windows deluxe, installed, mostly DH. I got this contractors name through Okna. My question is he gave me an exceptional price from what I see pricing give or take alittle is here. so I am nervous about using him. I believe he has no store and his over head most be low. He did point out things about my siding that needs to be cut back and all, which I did know about from previous contractors telling me. So question is if Okna is the one referring him am I safe using him? Also I have all double hung and one 3 casement he gave the one price per window no matter size or style.