Jasper (my existing conure) played hell with them and tried to chase them off. Then he fell in love with the female, and she seems to have taken him in preference to the male she came with. But they all seem to be happy sitting near each other, no attacking.
Grey's aren't really taking any notice. The macaw chased the new amazon a bit, but he does that with all of the birds. The 2 amazons don't seem to have clicked - but then mine is 5 and the new one is 9 months. She's really cute - semi-hand-reared, she sits on my finger, but no cuddling or stroking like the hand reared one.