Very proper and professional.
I had fuel starvation issues across the Gulf of Maine in the early morning approaching landfall, and they polished my tank, when I limped in. Unfortunately they did not (not did I) think to remove and blow out the delivery hose from the tank to the racor. So whenever the tank went below 2/3 the vacuum created to pump up the bottom 1/3 of the tank, was just sufficient to have some floating biomass move into a brass elbow fitting starving the flow. At low speed or with a full tank--no issue.
Portland YC figured it out in less than 30 mins and blew out the hose.
My friends in Belfast complain about the prices but get good service.