Duncan's a great GM who's knowledgeable on the rules, in-sync with the storyline, and always making sure each session is fun and exciting, even when being overwhelmed by undead or gunned down by space gangs. And is always seeking feedback, both good or bad, so if there's any problems just bring it to him and there's a great chance he'll help with it to the best of his abilities (but I personally haven't had any such problems). Will definitely be playing more campaigns from him!