I don't own any, but I have seen 7' emmys. Some can be docile, but many are not. If these guys bite you, it HURTS. They're got extremely long curved teeth (they hunt birds in the wild, helps them get through the feathers)

They obviously need a tall cage with a perch.. they need to be kept hydrated as they are prone to constipation.

Craig here owns many emmys.. I'm sure he can chime in here.