An ancient compressor (Chrysler 1973) on my older A/C unit failed. Mark came out in the evening and went straight to work diagnosing the failed part just to be sure it was dead. He tested everything and indeed it was dead. Every other contractor just looked at it and supposed it was dead. Mark actually tested the power, grounds, caps etc.
He gave me a very competitive written proposal for repairs. In the end I used another provider due to a very long relationship with that person (but at a higher price).
I would use and recommend Mark again at any time.