Superb company, entirely professional.
Dario and Andre are highly qualified and did a perfect install. They used threaded gas piping which is my preference, although it's a lot more work for them, and ran both exhaust and intake from the tankless across house width to get them out of the way (again a lot more work). All their work was neat and well-designed.
As a result, the furnace and tankless are running at top efficiency.
I would recommend Hurricane to anyone without hesitation.