you probably could have asked about ETB's and GTP's in the same post.

Do research, as you would for any new animal you plan to keep. Maybe even start with a less expensive more hardy arboreal before dropping $300+ on an animal you don't know much about.

Your going to get alot people telling you they are display animals only which has some truth to it. I've read and heard from many experienced arboreal keepers its all dependant on the animal and how you interact with it (as with any animal). I just picked myself up a gorgeous amazon tree boa for much less than what a emerald tree boa or green tree python would go for. I'm not experienced in arboreal and although I don't forsee things going wrong with the amazon it was less of an investment to lose should things take a bad turn.