I watched about 15 minutes of this to see if the 3D effects were worth sitting through two movies that I've already seen for 3 hours. They were not. So, I will not be watching the entire double feature. Don't get me wrong. I love both of the movies and Toy Story is probably one of the best animated movies ever made, but trying to factor in 3 hours for two movies I've already seen is a little bit rough. If you have kids who have not seen either of the movies or you yourself have also not seen either of them, you should most definitely check them out. If you have seen them and are going just for the "3D", all it really does is provide more depth which Pixar's ability to do is what makes them the best already. I did watch the intermission footage that gets shown between the two movies and that was actually pretty entertaining while you wait for the second movie.
I would completely recommend anyone who hasn't seen either movie to get out there and check these out. If you want to just because of the 3D - you should probably pass on getting suckered by Disney's masterful marketing department yet again.