This was a wonderful culmination of the Toy Story films! There were many messages targeted to adults - I love when they do that in kids movies. Many enjoyable scenes for kids and adults. Parents, bring your tissues.
Some parts were VERY intense, but nothing inappropriate nor TOO over the top. The incinerator scene was a little rough, but had a happy ending!
We saw in 3D - I don't think it was necessary. If you are looking to save some money - the regular film would be fine.