I'm not DMing the adventure path, but I'm playing in it. So far it's been great fun - very much a back-to-basics dungeon-crawl with some intrigue thrown in.
It is very, very helpful for at least one of the PCs to be a cleric of one of the major religions on Cauldron; a cleric of St. Cuthbert is an outstanding fit.
Sometimes I get the feeling that I don't know what the heck is going on -- why were the children kidnapped? and what about the other kidnap victims? who are the two mysterious half-elves? etc. But I guess many of these will be cleared up later. Still, it can be frustrating, and the DM has had to drop some pretty big hints on me a few times.
Finally, I don't know if the plot is time-specific, but I sure hope not. My PCs have been exploring the dungeon for over a week of game-time and are not even close to finishing it. And we ain't dawdling, either.