I purchased the product hoping to have some useful artwork as visual representations for my 5e Tales from the Yawning Portal campaign and to get a copy of the map for the Yawning Portal itself that was included with the original module. Per the customer comments thread the maps were included, which is not really the sellers fault, however, someone from the team could have wrote a comment stating the product does not include the Yawning Portal map. Basically I purchased a module with all artwork removed and no really usable maps which to me is extremely disappointing.
I did however give the module 3 stars due to some good information on NPC's for Yawning Portal patrons, good history of undermountain locations and levels, some decent d100 tables for generating random dungeon rooms, a ton of good traps and hazards that (with a litttle work) can be changed for use in 5e campaign, and one of the included maps is basically a blue print for creating your own version of the enormous level 1 of undermountain.
Overall, there is really good information in this book if you're willing to put in some time to translate the book into 5e rules but don't buy it if you are expecting visual aids for a Yawning Portal campaign.