Excellent. I was referred to Arctic by a friend who described them as high quality and honest. I called on the weekend and got to speak with a real person! She said I would get a call back and I did, within about 10 minutes! We scheduled his on-site visit for the next morning. He called again in the morning to confirm and to see if I had the model number of the unit so that he could pick up parts on the way to my house in the suburbs and save a trip back into the city. He arrived exactly on time, was quick, calm, and friendly. It ended up I only needed a relatively inexpensive part replaced rather than the fan (which would have cost over $500). Upon leaving, he reminded me to call next month to schedule a routine maintenance visit for my AC. I was so very pleased!