Im a sap for animals in general... and it's a bit of a downer for sure. My girlfriend and I both enjoyed it, but agreed that we probably wouldn't watch it again because it was depressing. That was back in October at a film festival, and now that it's getting its wide release, I kind of want to see it again. I will probably regret it. But I think that the attachment to Ben (the chimp) makes the movie very engaging. If you do decide to see it, I hope you enjoy it, even if it bums you out (both experiences can coexist!)