I ran this for a fill-in for a vacationing DM running Out of the Abyss. It works well with an easy hook if the characters are already in the Underdark. It's got some good RP possibilities and the combats can be fun. However, all the warnings about errors and needing to find errata are spot on. With some work, you can fix the errors and get the module into a shape that's not too hard to run, but it's probably going to take an hour of looking on the internet and annotating the writing.
[3 of 5 Stars!]