I think Rich hit it on the head. Temperament all the way. And although it may be hard to get things right at first, once set up they are probably about the easiest pet in the world to keep. All the work is in the rodents.
And, regardless of all our hand wringing and fretting with exact husbandry numbers, in the end, BP's are quite bullet proof. Just ask Bruce!!!
I have rescue BP's who have suffered abuses that no other animal could have survived.