Pay for the IMAX, it was great and worth it. Virtually no flaws in the 3d effects. So much better than the trailers can show it. Practically no boring parts as you usually have in a movie this long. There is an environmental message, but so much action, conflict, and other plot material that it doesn't get "preachy". However, it doesn't get confusing. Also has a great ending - don't worry, I won't spoil it.