Creativity. Seeing the essential things in life, around us, naturally.
Mania is the best experience ever. Only problem is it's also the most destructive.
But I would never trade what I got from it, even just the memory of the experience, not even the persecutory fantasies for anything.
Not even the hallucinations, though I have no idea what deeper revelations they might signify, I prefer delusions (when they're gone, but sometimes in the moment when they are autogenerated in your mind, actually I love that, persecutory or otherwise!), but I am forever thankful I got those experiences.
The friendships I tested have left me with the best friends a person can have.
The putting yourself together when depressed, exhausted from mania and mixed times. If you accept I bet you you can enjoy it.
But I am just accepting that way.

And borderline personality helps: if I had only the personality I would have to work hard for it, but now it just all comes automatically. Much better.