Hello! I have a 1989 green 300SE. Well, the transmission did a lot of so-called "rock-and-roll", wasn't smooth and very, very jerky. I have a lot of problems with the interior, especially all the rattling everywhere. I've sent in to the workshop over 5 times in the last few weeks... and I don't find it as reliable as my good 'ol 1983 200E.
Just my two cents