I considered only two companies for the job: UHS and one other highly-rated one from Homestars. In the end, I went with UHS because my friends, whom I trust, used them and because UHS was willing to give me a guarantee for the flat roof while the other company would not.
They showed up when they said they would and were super-fast, finishing by around 4:00 pm on the same day. I wish I could give an intelligent comment on the quality of the main roof job but all I can say is that it looks good to me and after 2 months, there have been no problems.
The garage job was to repair a shoddily done flat roof (by a company now out of business) that has been leaking in one spot for several years. Jason gave me several options and in the end, I opted for the cheapest which was to repair that one spot for just over $1000 and get a 5-year guarantee on no leaks there.
The first guy who did the job seemed to know what he was doing but it still leaked when it next rained. Of course, I let Jason know and he promised to send an expert (he said it was the guy who taught him). That guy was incredibly thorough. I didn't expect them to go right down to the wood but that's what they did, replacing the rotten planks and then putting layers on top. I'm very happy with the work done.
The garage roof repair obviously turned into a bigger job than Jason had thought but he stuck by his price with no push-back or hesitation, and that's one big reason that I wouldn't hesitate in recommending him to friends.
Edit on Dec. 3: I had originally commented that Jason hadn't stopped by to look at the work but later found out that he had and just hadn't stopped in to talk to me which is not a significant issue.