We all know how good the film is, so I'll keep the review purely about the 3D. Even though my expectations weren't overly high, as it's an old film, I was still excited about seeing this in 3D.
Unfortunately, it was a bit of a let down from the start. I haven't seen the Blu Ray version so not sure what the quality of that is like, but this is just purely terrible. As another reviewer says, it looks like a VHS version. There are two or three plane scenes where they fly across the sun where the 3D is at it's best and the picture is crisp and vibrant. But other than that, there aren't many other good things about this version. It didn't take my breath away..
I wouldn't recommend this version to anyone.