I just ran this with four 6th level characters. The story ran smoothly, clocking in at about 7 hours with heavy roleplaying. My only complaint came from understanding the layout of the lighthouse. The map itself illustrated 4 levels, but was labled as 3. I took this to mean that perhaps the living quarters were a loft to the kitchen area. Also, the location of the scaffolding, ladder, and hatch was confusing to my players, even with the full scale map. More descriptive text and map abels would have helped myself and the players. Aside from these minor areas of confusing, this was a fun one-shot!
[4 of 5 Stars!]