The movie was very good, the sound system made the explosions much more effective. The 70MM print made the picture very clean and sharp. The movie is definitely worth seeing.
However, if you are expecting the full IMAX experience you will be disappointed. The screen at the Hoffman IMAX is not the 5 story screen you will see at the Air and Space museum downtown or at Dulles. This screen is not much bigger than the screen at your local theater (main screens). This particular screen is more a "RealMax" screen, not a proper IMAX (see the IMAX website).