I owned an older Mercedes for a period of time. The car had its quirks as one might expect. I took my car there to have a steering issue looked at. At no point was a mention made of a charge for an estimate. They looked at the car and had it ready by the end of the day. The repair bill was moderately expensive (to be expected with Mercedes). I told them I would get back to them about what repairs (if any) I'd like to get done. They asked if I had been told that there was an estimate and I said no. They proceeded not to make a big deal out of it and didn't charge me which I thought was very fair of them. While I ended up just selling the car, I did have alot of respect for them and their fairness and would have to say they were very thorough in their diagnosis.
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