I have it. It has a more loose feel than the 3 Heroic modules, which IMO is to its advantage. Rather than a complete the dungeon beginning to end, it is more focussed around foiling a villain's plan and encountering the prophetic ghost. In combination with the FRCG I think this makes for a much more flexible adventure structure.
Overall, I would rate it the best module yet, though I preface that by saying that I found H1 to 3 to be rather dull as they were too strictly formatted to a pure dungeon structure (H2 was the best of the lot).