My experience with Zen Windows was great and I would highly recommend this company. I called a couple of the other window places for a quote, and had to sit through the high pressure sales meeting at my house. I found Zen Windows on Angie's List and did some research because the reviews were good. I must admit that at first I was skeptical of Zen's sales process, which can be done over the phone with no visit to the home. However, I sent Dan a message through his website, he called me back shortly thereafter, and we discussed what I was looking for. A few minutes later, there was a quote in my email that was considerably less than another company's quote for a very similar window.
I told Dan I wanted to purchase the windows, and he had his installer, Bob, come to my house to measure for the windows. Bob came to measure on a Saturday (which was very convenient for me), and then ordered the windows. A few weeks later, Dan called me to let me know the windows came in and that Bob would be calling me to schedule installation. Bob called me a few days later and scheduled the installation about a week out. The installation took two days, and they did a fantastic job with the installation. I must admit that I was really impressed with the quality of the installation. Also, I did not pay one penny until the job was done. Dan called me the same afternoon the job was done to follow up and to see if I had any questions.
All-in-all, I would highly recommend Zen Windows. Not only do they make it easy to buy windows, they made the whole installation process pretty painless as well.