Is the Axe 2 worth it? In my opinion no... I don't think there were to much of a difference between the first Axe Fx than with the Axe Fx2. Not enough to justify that an Ultra goes for about half the price used.
BUT with that said, Axe Fx2 is made to be upgraded majorly and it's definitely going to be worth it in the long run.
I will always prefer tube amps before using an axe fx for recording, but other than that they are excellent units well worth all the hype they're getting.
Here's my latest AxeFx2 video for those who haven't seen it: