My daughters and I have enjoyed the first two Toy Story installments MULTIPLE times. It's a story that never gets old. This last movie was a great way to end it. It's also a great lesson to little kids on how to treat/care for/let go of toys. All of them were entranced from beginning to end. The ending, while a little predictable, still made me cry. All in all, it's a wonderful, heartwarming movie. Woody and Buzz are unforgettable.
If you're seeing this movie and haven't read the book, it's a great movie. If you're seeing it after reading the book, you're going to be disappointed. It doesn't follow the book really at all. Motivations and characterizations are very different. But they did a good job with Harry's character.