DR88:

I have used rebuilt alternators for over 30 years and the only stipulation I would make is buy from a good source and/or with a good warranty. As usual, this must be balanced by cost. Most online parts sources sell the Bosch premium rebuilt alternators which have always provided me good service. Europartsdirect, whslparts, exprsautoparts, etc have them for $142 up.

As far as difficulty to replace, it is quite easy basically, depending on one's experience. If you want to try it, get instructions (I can send you the info from the MB CD manual).

As far as rebuilding the alternator yourself, I would say that it would require more experience than just switching one out, and quite a bit more time (depending on the extent of the rebuild you would do).

Finally, I just replaced the alternator on my 300CE - took me 3 relaxed hours. The prior owner had done the brushes/regulator thing and it lasted 27,000 miles.

Cary