Before I went with National Star Roofing, I got three quotes from top-rated roofers in Homestars. Sokol was fast to respond. When he came to do the quote, he brought the baseline documentation I had expected (business license, insurance policy, etc.—companies don't always provide this unless you make a point of asking), explained the differences between the shingle samples and various options, and promptly provided me with two different proposals, both of which beat the two other quotes I got. (BTW, I don't recall exactly what I paid, but I recall it being under $10,000.)
They arrived promptly on the scheduled day and got the work done quickly. As they did the work, Sokol messaged me pictures so I could see their progress and to confirm that the things we agreed to were being done. They left the site clean. Several months after the work was completed, he sent me a text to check that we were still happy with their work.
I chose this company mostly for their low price and high ratings. But I'd choose them again because of their customer service too.