Las Vegas, NV
I phoned them up to have my locks swapped out and was happily surprised to get a time slot for that same afternoon. The technicians they sent were highly professional and on time. Not only that but they checked our smoke detectors as well (which I had no idea was even a locksmith thing) along with the locks on all our windows.
The guy arrived early and that was perfect because I had to go out of town later and every minute counted. Cleaned up after himself really well. Generally quite friendly and gave me a courtesy call when he was on the way, too. he apologized for not being faster even though I was surprised by how fast he was. I guess he really sets the bar pretty high for himself. Satisfaction all around over here.