We are using this product to communicate between our web application with other java software running in different servers/platforms without worrying about security issues as it uses SSL by default which protects us from many attacks like sniffing etc., It also supports AMQP protocol so we don't need any extra plugins or libraries if required but not much useful things I have found out till now just some minor errors while installing such thing at first time (like missing packages).
Try before you buy because there might be something new coming up every day! Security related problems solved when communicating through Mqtt protocols instead sending messages directly over network connections where they get intercepted easily due lack knowledge regarding them.