Very worth seeing. Apart from what it shows about the old "trying to find the perfect girl/boy" thing, the movie tells a lot about creating characters in fiction.
I loved the part at the end when Calvin, trying to explain to an audience how Ruby became real, talks about the Catcher in the Rye and says that Holden Caulfield was real too. In a way, he was, he is. As many other characters are, for lots of readers. How could they not be for the writers themselves?