I've had my share of both real snappish and fairly laid back. I did get an adult male pastel that was an angel from the moment he came home from the show. He was just a doll baby. And he loves kids. He just goes from kid to kid, just gentle and mushy and not head shy at all. Kids love him right back, he's so tame around kids. No jerking or sudden movements, even when the kids get a little rowdy. You couldn't ask for a better pet.
And the funny thing is, the breeder I bought him from said he was a breeder only, and had never been handled, so I was told expect him to be snappish and aggressive. Apparently he never got that memo.
On the other end of the spectrum, I've had a couple come to be as rescues that took weeks to months to settle down. They huffed and snapped and thrashed, refused to eat and were just all around difficult animals. The good thing is, most BP's turn out to be good natured snakes when given a little time and patience.
Gale