The best feeling though when the group comes together is not only knowing your role, but redefining it.
My buddy was a shaman, but in reality, he was the all purpose "I can do everything" guy. He could off-tank very well, and I understood agro better than most I knew, so it was easy for us to get comfortable in our styles of play.
There is no better feeling than standing with 1 other friend over the corpse of a boss that needs 5 players above your lvl to kill...and then laughing about it.
I just hope he decides to come with me into Vanguard!
-Eclipse