If you do a search for "4matic", you will learn a lot about this feature. Some like me love it, some hate it, but when it works, it is outstanding for traction. However, if you will not need the 4matic where you live, then I would recommend you to stay away, as the system is costly if it needs repair, so why subject yourself to potential headaches if you don't need to??

You don't mention the year car you are considering, but the W124's are notorious for the original transfer case leaking around 125,000 miles, thus requiring a replacement. Some owners disable the system via a switch for towing and repair diagnosis purposes, but it is my understanidng that this also disables the self-leveling suspension, thus affecting handling and who knows what else.

1962 MB 220SEb Sedan, 197,000
1992 MB 300TE 4Matic Wagon, 144,000
1995 Subaru AWD Wagon, 126,000