As an aspiring DM, I found this adventure to hit on all three pillars of D&D (Exploration, Role Play, Combat). The book is broken down in easily consumable parts, the maps are straightforward, and the scenery is a fresh take that avoids 'traditional' Underdark entities.
I am running for two players (and they each use a side-kick) and so far they seem to really enjoy the adventures. Using gTove (https://illuminantgames.com/gtove) as my mapping tool and Discord for chat/talk has worked very well. The included maps import into gTove easily and character portraits and art of scenes are bonus additions.
I look forward to using the Appendices to enhance the adventures after the core stories are completed.
Having used other tools from this author, I would like to point out the high quality and thought that seems to go into Sly's creations. I have the hardback, pdf, map files, etc...and I am very pleased with the overall quality of this product.