I just replaced my '84 300Sd tumbler.

I chose to go with the Mercedes factory tumbler for $54.
It came with a new key that matched the door locks and the trunk lid.
I had to bring my title and ID to the service desk to prove I did in-fact
own the car, and went back the next day to pick up the new tumbler
and key. It installed without too much problems.

The tumbler and key are good quality, and I don't worry about the tumbler
breaking or wearing out and the tumbler getting stuck in the locking
cylinder like the old one did.

I could have gone with an aftermarket tumbler for ~$24 but then the
key wouldn't have matched the doors or the trunk, and I would always
have worried about the tumbler getting jammed/locked in the cylinder if
it failed.

Peace of mind for ~$30 bucks was worth it :-)

Will

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Will W - 1984 300SD federal