I've run the Dragon Slayers playset multiple times for different groups and really enjoy it - it tends to generate very interesting, zany fantasy stories full of the typical D&D cliches and tropes. Overall, I think Dragon Slayers is a bit more of an "advanced" playset though (or maybe intermediate is a better term) because it's set up for the story to unfold after the dragon has been slain, built around the aftermath. As such it requires a bit more preplay discussion to get everyone on the same page and to make sense of some of the elements that can come up during the initial set-up. Overall though I think it's a great playset and is one of the ones I pack for cons.
[4 of 5 Stars!]