I saw it and thought the conversion was amazing. Like I'm totally sold on conversions now as a result, cause the level of depth was awesome and immersive, without resorting to gimmicky stuff for the most part. To be fair, I haven't seen Titanic 3d so I can't really compare it to that, but I think its miles better than the modern day conversions I've seen like the Avengers and Conan. It was interesting too, because all the 3d previews beforehand looked really distracting and fake to me (I have no interest in Iron Man 3 in 3d now), but once JP started it was really solid. I suspect a lot of this might be down to the use of lots of Practical effects, which work way better in 3d than when there's tons of obviously CG things flying around, as well as Spielberg being really good at framing his shots with multiple layers of depth.