Actually it holds up quite well because of the subject matter. Unlike something like Toy Story 1 which came after this. In that Pixar were portraying real world things. And trying to capture realistic lighting. But unable to actually do it. With reboot they were portraying a world imagined inside of a computer. And while we might be able to do even better today than they were able to. For the time it really does encapsulate and capture the vibe.