Whatever you do, you MUST see it in IMAX 3D -- however, DON"T do it in a sold out presentation... we ended up sitting in the first row, and looking up from the base of an over 50-foot tall screen for almost 3 hours is deadly... worse yet is that the 3D effects are a bit "off" from that angle.
I won't bother waxing poetic on the story or quality of the CGI, I'm sure there are now 1000s of reviews before mine that have done so... I'll just say that the technology has finally matured to the point where, in this film, the line between fantasy and reality was brought SO much closer to completely disappearing.