I have had the WORST experience ever with window world of dc. First of all they say the sell a 189 window installed, thats a lie. yea sure they will install it for 189 but you gotta get this and that (you have to get the ext. trim and low/e argon gas and any other options more $$$) AND the 189 is their LOW END window...so youre gonna be spending 300-400 per window. Ok so that isn't the bad news...oh and the sales ppl will show you reviews and comments from previous customers raving about the company but I think thats total bs probably... read full review »