Although this discussion is a little outdated I wanted to raise my hand anyway. We are using UDT to get an idea of how many ethernet ports are actually used during a semester. Based on the results of our findings we hope to reduce the number of network switches we have deployed across our campus environment.
We simply use UDT in conjunction with NTA and NPM for identifying users' ports. It's super simple to search on user's name (eh hem... not the username.. but their name ie, "John Doe" not "JDoe") to find out which device and switch port they are accessing. Works great in our small environment.
We plan to enable sticky ports for port security and limit each port to only one device... This, however, will not allow us to use our Fluke on those ports. Although I suppose I could set the device limit to 2 and walk around with the Fluke to dynamically assign its MAC to every port as the second device.... Regardless, having UDT will allow us to search for users on our network without needing the Fluke.
I would love to see how others may be using UDT for port security, as it seems to have capabilities to white list MAC address on the network instead of setting up port security on the switches themselves.