The plugin itself is good, has rich features and run just fine. The downside is that the plugin has slow update, slow bug fixes, wiki too short and simple, and there's memory leak that people reported and still unsolved.
I just hope the dev would spend more time on this plugin.
As for the memory leak issues, we've done a lot of studying into it and we are pretty confident it's out of our control. :( The way Bukkit servers handle hot-loading worlds is very poor and can sometimes result in the worlds getting stuck in memory. I have personally done everything I can to reduce the memory footprint of the dungeon otherwise. Thanks for the review!