Loved the use of silence in space, even subtle things like the boosters firing silently. But, by far, the sound design during the rocket launch was what stood out to me. King said he wanted it to feel like the ship was on the verge of breaking apart and honestly, it felt like the IMAX theater was about to break apart! I realized many times during this movie I was about to crush my poor wife's hand. :)
I agree with other posters about the unclear dialogue at times and also the score was painfully up in the mix at times. Really liked the organ though and also the dissonant stabs during the docking sequences. Lots of tension and emotion in this movie.