I can see it both ways. My wife is definitely the calmest, most level headed person I know and sometimes it's great because she is able to think rationally and bring me down to earth when I need it.

However there are times I really wish she understood me more. She doesn't get what it's like to be depressed or incredibly angry at the world so it's hard for her to understand how to comfort me when I get like that.

I do have a really good friend who is bp so I think that helps because I can bounce ideas off of her and I can find the understanding I crave at times too.