Our local dealer is offering for sale a 2001 ML 320 with 50,000 miles. It has been their courtesy vehicle, taking customers from the dealership to home, and so forth. They want $23,000 for it--is that a fair price? Is there anything I should be concerned about in these vehicles? I have driven and serviced my own MBs for 30 years now, but never an ML. Your opinions would be appreciated.

Joe B.