[Star8urst]

But you must consider the posibility that taking 4 of your friends and killing higher level mobs is better xp than questing (at the very least the travel overhead will be gone.)

I'm not in the beta, but from what I read, part of the quest reward is a nice amount of experience which makes questing faster leveling than just exp grind. You also get items which help you gear up better than what you get from normal exp grind.

So it seems that getting 4 of your friends and quest is actualy better than just getting 4 of your friends and kill mobs for exp. Also some quest make you kill higher level mobs too, so seems like it's a win win system.