I'm about halfway through reading this adventure and so far I am of mixed emotions. On one hand, there are some particularly cool ideas and set pieces that I like. For instance, the inclusion of Sigil and the PC's wading into a meeting between a bunch of demon lord aspects is pretty wild and as a player I'd be psyched up for this. On the other hand, to me, the execution seems pretty poor. Some sections of it seem short and choppy (here, fight a few drow and then hop over to Sigil - this could have been expanded to make an early mystery hunt before throwing the party to Sigil). Rule of Three is a pretty cool NPC but having him basically send the PC's on quest after quest is not very ingenous or exciting to DM or to be a player for.
Overall, the module sets a grand adventure that if pulled off could be possibly one of the best to come out. Unfortunately, some of the plot is too stretched and without some DM editing I believe it is not believeable. Some space is wasted on encounters that are not likely to happen and there is the occaisional error from time to time. All in all, I will be running it as I am a sucker for a grand scale adventure and this is definately that but I certainly think it could have been pulled off much better than it has been.
Overall, the module sets a grand adventure that if pulled off could be possibly one of the best to come out. Unfortunately, some of the plot is too stretched and without some DM editing I believe it is not believeable. Some space is wasted on encounters that are not likely to happen and there is the occaisional error from time to time. All in all, I will be running it as I am a sucker for a grand scale adventure and this is definately that but I certainly think it could have been pulled off much better than it has been.