Great one shot, really enjoyable! Ready to run right out the gate with very little work on the DM's part, so it's great if you need a one shot quick. But I also really like the theme of it, it's a really neat adventure to be included in a campaign and lets players pick up a wealth of unique items should they succeed.
I ran this one shot for a group of 3 level 12s who were kitted out well with magic items, and had 2 low level pets. They succeeded and had a fantastic time, the boss fight is definitely the highlight of the module.
[5 of 5 Stars!]