No matter what kind of snake, or animal for that matter, it's not if you get bitten, it's when. Reptiles are wild animals and shopuld always be regared as them. With that said, most boas can be hand tamed, some can even be affectionate. Most biting inccedents can be blamed on the owner. Boas have VERY clear body language. They will hiss, puff up, mock strike (striking without intent to bite, just to scare) and it is the owners reasponsibility to read these signs. Of course there has been hundreds of freak accidents where people get bitten for no apparent reason. I've been bitten by several large boas, and it HURTS. It isn't as bad as the taboo about snake bites makes it seem. All speciese of snake has a different bite. I would rather be bitten by a 6' red tail then by a 2' rainbow. You can't own an animal that you are afraid of. Boas are my favorite type of snake, so I would say get one if you decide to get one, get a red tail (not argentine or central american, they are known to be extra nippy). Red tails, columbian, peruvian, guyanas all have wonderful temperments if you handle them daily when they are young. Good Luck!
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Alone, alone, all, all alone. Alone on a wide, wide sea.
-Rime of the ancient Mariner