Peru boas can be nippy, and carry that on to adulthood. Honestly, a good deal of their "tude" relates to the care they are given, IMO. But there are some that are down right nasty (more or less). I have a few 5 year olds that are jerks in their cage, but okay when out. A 6 year old that keeps me on my toes 24/7.
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But some of them are just softies. My eldest Peruvian is a gentle giant, lots of the midsized are fine too. And lots of babies that are easily hand-able.
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Husbandry and lots patience pays off, more often then not.