TL;DR: Good dungeon crawl, interesting traps, combat undertuned, slightly too short.
I'm a big fan of the traps in the module. They are interesting, provides a fun challenge for the players to find out the answer and overcome, without being over-complicated. My personal favourite is definitely the trap where the players are faced with their worst nightmares, and allowing them to describe how their characters' overcome the nightmare. That was the highlight of the module, and a great moment for RP and character development.
Now the downside. As many have pointed out, the combat was too easy. Maybe the intent was to balance between the ease of combat and the difficulty of the traps, but it was undertuned. The optional fight with the Fire Snakes had potential to include more interesting Fire Elemental monsters, and the final boss fight needed more challenging Yuan-Ti monsters (luckily they are fairly abundant from the other Tier-3 module).
I think this adventure has the potential to be great. It just needed a bit of adjustment of the challenge difficulty, which relies on the DM's experience and judgment to accomplish. As long as the DM puts his/her DM liberty into good use, this'll be a fun run.
[4 of 5 Stars!]