Having not lived through it, but having seen a glimpse of its aftermath living in Berlin a few years, it was very interesting to see the contrasts between the Ossis and Wessis (at least ones that were say, at least 18 in 1989). In general, I found the Ossis to be more friendly and open and fun loving. For example, an Ossi party would usually be louder, messier, and have worse food, but everyone would be laughing and a guitar might come out at some point. The typical Wessi party I experienced was perfectly catered, everyone was perfectly dressed, and it was in a perfect house, but people weren't necessarily having that much fun.

Now this is different in other parts of Germany, but it's an interesting natural experiment, because these guys were literally in the same city.