This adventure is great and terrible all at once, but I really enjoyed it overall. The main villain is probably one of the most fun that I've ever had, and gives players their likely first battle with a legendary creature. This is an adventure that is plagued by the terrible season 8 formatting, which really hurts it. However, it has some very fun encounters that aren't all combat.
To run this best, I recomend that you have the rooms mapped out first if you use maps and miniatures. It will save a lot of time. Second, read and re-read the adventure. There are a lot of parts where you will need to ad lib. A DM who is good at this will be able to make this an incredible adventure. DM's who prefer to not adlib much will probably hate this adventure.
A lot of negatives to this adventure, but the fun factor was huge and my players had a great time. The villain is a blast to play and gave the players a huge sense of accomplishment when they won. Buy it, read and reread it until you know it well, and give your players a heck of a good time.
[4 of 5 Stars!]