I'm bipolar and yeah, the creativity is great, but here's something else: harnessing that creativity is rare. I have to be either manic angry, or.. yeah.. that's about it. When my mood swings to depressed, I don't want to do anything, and when I have manic happiness, I don't want to work. And it sucks, you get depressed or angry, then when your mood just swings to happy, you don't know why the hell you were feeling the way you did in the first place.
It's not some beneficial thing since, you know, you have to deal with some messed up depression. You're a time bomb.