I've called them twice. First time a few years ago they came out to replace a broken carriage. Diagnosed it over the phone and gave me a quote. Replaced it and re-balanced the door.
Just today I called them again with a problem where my door wasn't working. They diagnosed it over the phone, gave me a quote, but also gave me a couple suggestions to try first. After 40 minutes of work with my drill and socket set, I had the door fixed myself. Will definitely call them next time too!
Pros: knowledgeable, on time
Cons: none that I've found
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