Lately BC is on a IMAX 3D craze....... every new movie that is released, he will check to see if there is an IMAX 3D version. Ticket is not cheap at close to $20 per pax (I'm not sure how much it costs since I am not paying for it, lol) but the movie experience is indeed very very very different from a normal film and even 3D version.
IMAX 3D is quite a cool experience and you should try it if you haven't. It's not something you want to try often since it is not exactly pocket friendly but if you choose a good film to get the full experience, it is most definitely money well-spent. :)