This is a great piece of software in terms of presentation and ease of use. However, it can make your life difficulty if you want to do anything outside of the scope that the authors intended. It's very difficult to build dynamic UIs with chosen select boxes because there's zero documentation of the code itself, which is what you'll be modifying if you want to do anything advanced. The devs did a good job building a select box, but a bad job making it extensible and documenting it.

Overall, I'd recommend it if your needs are simple, but you might be better off rolling your own or using another library if you need anything advanced.