I think we've misrepresented ball python eating habits--it's not really that they're "finicky eaters" so much as that it's natural for them to fast for long periods. Usually this means your snake will skip multiple weeks in a row and only eat a dozen mice all winter, while it pounds them down like candy during summer. Sometimes it means your juvenile will decide to go for 5 or 6 months without food.
While this is often stressful for a first-time owner, it seems to be perfectly natural, because almost all of them skip meals at some point or another. Apparently it's just what they do instead of hibernating! And, well, it does save you money on mice.
(Rosy boas: they only one I've really spent any quality time with was being passed around at a party. It did really well with the first 10 or 12 people who handled it, but after an hour and a half it decided to chomp down on my friend Doug's ear. And wouldn't let go.
So based on a sample of 1 I'd say: rosy boas are extremely tolerant and docile, within reasonable expectations.)