They record all information provided to you so no repeating and confusion.
They were accurate on timing and took extra time to fix something that came up btwn the appointment making and bringing it in. (No need to make another appointment)
They aimed to fix if possible, were clear about their limitations, and aimed for the most economical and safe approach.
They clearly explained what they did and what the above problem was and how they fixed it.
A bonus: friendly customer service!