Kim is dead on as usual. GTPs are not what I would consider to be an aggressive snake in the slightest. the neonates are snappy, and certainly there are some adults probably best never being handled, but I've had absolutely no issues with my adult sorong x jaya. although I have found it useful to keep a water bottle on hand and spray him down once or twice before handling. it seems to make him aware that I'm not bringing dinner in tow. I've posted this picture before, but it's indicative of his personality every time I take him out:
I have no experience with other arboreals, but I would recommend GTPs to anyone.