I've spent the last two weeks aggressively playing Vanguard. Just reaching 55 was the start of it. We've been raiding, and working on high end content like the Pantheon of the Ancient's God trials (Those are hilariously fun) and on Dec 26th, we finally completed a really hard, but really rewarding questline:
I got a gryphon flying mount! Yay! Yes, that's a screenshot from the game.
Here's another pic with all my stuff in view.
Best Xmas present ever! We're hoping to get more of our guild through it so we can take it one step further. You can do a special Raid event to upgrade it. Then it gets some really cool armor and stuff.