I've seen the movie in 2D, standard 3D and in IMAX 3D, and I have to say if you can see this movie at the Imax, it is definitely the best way to see it. It is also the best use of 3D in any movie I've seen. The 3D effects are used to immerse you in the movie, not just to startle you or make you jump. As for the movie itself, it is very very well done. Of all the long movies I've seen this one really makes you forget time passing. The story is well done and balanced. The only negative I have is the the ending is a bit rushed and some of the things the Na'vi do is out of character and stupid (in the battle scenes). But over all it is a must see movie, and especially worth the extra cost of seeing it at the IMAX.