A slightly larger screen does not constitute the" IMAX experience". Unless you are going to a legit IMAX theater (real wide screen that kind of makes you sick to your stomach in flying scenes - you know the one), save your money and see it in 2D. 3D is not as sharp and is actually a distraction.
But from a movie history perspective, you must see this film. It ushers in the beginning of the next step in film making. Sure the plot is boring and full of new age hyperbole but the visual and sound advancements alone make this an important film. Eventually a great story is going to be paired with this form of movie making and it is going to be trans formative.