The library has been very helpful to implement cryptographic functions for our project, it's easy-to use when compared with other libraries like Java Cryptography Extension (JCE).
It works well but I think that they could improve some things such as more documentation about its usage or maybe even add an online tutorial so people can learn how this tool really work without having problems later using them. We are developing web applications where we need security features and encryption tools because all information will be stored into databases which have sensitive data from customers' personal informations until their accounts details.