Overall, my experience with Gold Star does not deserve a "Gold Star". They are more 7/10 in my books. There are varies reasons.
Positives
They were punctual. They were on time for all of our meetings. The price was reasonable. We got a couple of quotes and they weren't the lowest but their quote was also half the price of the most expensive one. The installer crew were polite and fast. It only took them half a day to install all of our windows.
Negatives
1. My initial contact with Gold star was by calling their office and making an appointment for a quote to redo all my windows at my house. However, they had to reschedule with me 3 times because of their miscommunication between the office and the person who comes to provide the quote. In my case it was with Ilia. At the time I was a little annoyed but I was understanding and thought nothing more at the time, but it's just one of those things that just add up.
2. After we have signed with Gold Star and were waiting for our windows to be installed which was about 1.5 months after, we needed to know the exact dimension of our bathroom window so that we could frame around the window. (We are renovating the house at the same time.) So I called Ilia, to ask him the dimension of the bathroom window that was ordered for us, but instead of answering he gave me a demeaning tone and asks why my contractors cannot use a measuring tape. He then went on to provide instructions to use a measuring tape, but not so much where to start and end the measurement.
3. Although the installation of my windows was fast, they did not install all the windows as specified. We wanted frosted windows in our bathroom window because it was right beside the shower, but the windows were installed with clear glass. The installers told me it was not a problem and the office knows. He'll just need to come by to switch out the window pane sometime later. This sometime took another 1.5 months. They didn't start looking into fixing my window until 3 weeks after. It was 3 weeks after because it was when I called. They kept promising to come to fix it and it kept being delayed. It took them 3 weeks after my call and many other calls to finally come by my house to switch out the window pane.
4. Before my bathroom window was fixed, they called me to provide a review for them on Homestars and give them a 10. Yes they specially told me to give them a 10, not just to give them a review but specifically a 10. I thought that was kind of rude.
Bottom line: They don't have the greatest customer service, but they are reasonably priced and if you are not in a rush for windows and don't mind the rudeness give them a call.