Filming the IMAX 3D was a huge endeavour that consumed a vast amount of crew time. That said, the movie turned out spectacularly, IMO. I've seen it in 3D on the IMAX screen and it's just amazing. I doubt the 2D version on the small screen does it justice. I also got to see a lot of the raw footage in IMAX 3D, which was really cool to see the various takes. I hope some of the outakes made it into the DVD. The crews all enjoyed filming the movie, but I think Expedition 2 took the cake - they had a lot of fun doing it as well.
For anyone who hasn't seen it, I recommend the movie - and if you can see it in IMAX 3D, it's definitely worth it!!