First, they came within the exact time slot they said they would come.
Second, Chris was completely honest and said my clogged bathroom sink was a quick, easy fix. He even said he would show me how to fix similar problems on my own. He was patient and clear in his explanation. In the process, he explained how sink drainage works. Totally clear, useful and obviously caring about complete customer satisfaction.
Third, he said he would only charge for a service call.
Doesn't get much better than this.