I had a flex disc failure, which wasn't epic, just slight vibrations one day. It got progressively worse over the next 2 days and I thought it was the center bearing, but it wasn't. I was able to change it 2 days into the bad vibration part. Everything went back together smoothly with no issues. I've been driving it around and car runs really smooth, no vibrations, not even slight. However, I did notice now there is a humming or droning noise from the rear. Best description I can think of is one of those small planes with a propeller on each wing that you can hear that's sort of far away. Other than that, there isn't any other symptoms.

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1990 190E 3.0L