The ease of using the SDN controller. I have used other controllers in the past but the UI/UX is much better than others. It is very user friendly. Sometimes it gets stuck for a while. But this has been fixed after some time. Nothing at all! This is one of the best software defined networking controllers out there. If you want to leverage the benefits of software-defined network without investing a lot of money in hardware then go for it. You will be glad that you did. I am solving my traffic management challenges by leveraging software-defined networks.