It's impossible to tell what they'll be like.
If they can travel several thousand/million/billion lightyears in a spacecraft... I'd say they would be pretty damn advanced.
Judging how we treat each other in the world, I don't think they would take kindly to us being a war-like, greedy species. If we treat each other like stuff why should they treat us any better?
Our governments will lose their stuff and we'll attempt communication but they'll do something like try to communicate back and we'll view it as potential hostility and be like, "HOLY FU- NUKE THE BASTARDS!"
I'm sure they can do loads of crap we can't.