Very positive. The problem that we had was intermittent and they spent a fair of time trying to track it down and repaired what could be located. This involved a waring light that would flash on and off. Since it was a non-critical system, they advised waiting for the problem to become "solid". However, what was done (cleaning of contacts, etc) seems to have fixed the problem for the time being.
At the same time they noticed another problem (serpentine belt) and gave me an estimate. It was late in the day so I needed to pick up the car. I plan on having that repaired next week.