Details from IMDB:
9 years is good while to wait for a sequel. To be honest I didn't think I'd ever get a Toy Story 4 but I was wrong and thankfully I got to see one more movie in this beloved franchise.
This is a great movie, I've got to say it's such a rare thing for you to look forward to a sequel for years (the 4th one at that!) and not be disappointed. While I'm sure Pixar has made some disappointing movies, I haven't seen any of them.
All the actors do a great job with the voices, the animation is incredible and while the story is good for kids, there is also plenty to appeal to adults. This one, in particular, is dealing with how life changes as we get older. How we have to search for a purpose and find where we belong when we have to let something (like a job) or someone go.
I don't want to spoil anything so I'll just say it was also very pleased that this time the villain is just hurting and misunderstood, this character as well shows some real growth in the movie.
Stay during the credits for some great bonus scenes and if you really love Toy Story stay right to the very end, there is a little something to make you smile just before the lights come on. I will miss Toy Story but I do firmly believe this is an excellent place to stop. It's a very satisfying ending that does all the characters justice. Sure it's not perfect but almost no movie is. Is this is best of all of them? I'm not sure but it's up there, I give it a very solid 8 out of 10 and would highly recommend it to anyone young and old. Sure if you saw the other 3 movies you'll enjoy it more but you really don't have to. It's also a rare thing where I can say bring your kids, they'll enjoy (hopefully) as much as you will.