They stay a pretty manageable size, never getting big enough to hurt anyone, and from my reading they are very docile snakes. Of course bites occur, it doesn't mean they are mean it's just a response to a variety of things.
The only thing I read is that sometimes they can be picky eaters. But there are people here who can tell you waaaaaaaaaaay more about BP's than me. So I'll get out of there way.
I will say this though, they are on almost everyone's list of top 4 beginner snakes.