In a word...Excellent!
It is too bad that I cannot rate them higher than 5 stars, because I would. I got 9 windows installed on my townhouse. My top floor bedrooms were roaster hot in the summer and we couldn't take it anymore. I get 5 hours of direct sunlight on these windows and the day after the windows were installed, the rooms are cool again...and I haven't even had chance to hang my blinds back up! WOW.
I found the company on a contractor's blog and everyone raved about how good and reasonable they were. Their prices are VERY reasonable and the workmanship is better than I expected! My windows look great. The staff kept in constant contact with me from consultation, to measure of my windows and on the status of my window order. I think what made me feel really sure about this company is that they only use installers that are employed by them only....no day laborers!! Installation was quick with an great attention to detail that you do not find with a lot of companies these days! I highly recommend this company!