Saw it yesterday. Enjoyed it a lot. It's just a good story, well told.
But the 3D is just as disappointing as ever. I went in hoping to be wowed and the best I can say is that it was the best use of 3D I've seen, but it still didn't add more to the film than it took away. The disadvantage of reduced brightness and increased blurriness is greater than the advantage of increased depth and more imaginative layering of images.
I appreciate Lee's brilliance in using 3D as part of the creative process but the finished product is still less enjoyable than a well-directed 2D film. And if anyone's seen Searching For Sugarman, wasn't the storm sequence in that so much more effective than the one in Pi? No 3D, no special effects, just a really convincing soundtrack and beautiful visuals.