AppDynamics is a great application. It has helped us detect application bugs, hardware problems (based on trends) and network issues within our network. Currently, our supply chain is using AppDynamics.
I didnt like any of the functionality or the layout this application provided. I saw the growth with AppDynamics and the possible potential mainly because we have visibility to the actual application code. This is one of the best options by far to ensure the vendor fixes bugs in the code.