This is a pretty fun modules, as with the other DDEX season 1 mods I've run thus far. Players enjoyed it. To start, I really like how many of the modules are not only tied into the seasonal theme of dragons, but have common touchpoints (Mantor's library, for example). I was able to ad-lib in a NPC from DDEX 1-06 (we ran that first) named Casra and the PCs liked getting to work with her again. Nice touches like that.
As with many of these modules, there is some investigation at the outset, and then the last part winds up being a bit of a dungeon crawl. This isn't a bad way to do it. In this case, there are some NPCs who the players may/may not fight that are fun to role play, and my players had a good time interacting with them (Spernik and his kobolds). They used some guile to get him to help them, and I rewarded those efforts as much as if they had killed him.
Few issues: First, Spernik is written more like a thief than a cultist with spellcasting abilities. He's 19, talented but a bit impulsive, yet scared out of his wits of what the cult will do to him if he fails. I would expect a character with clerical powers and a reasonably high wisdom to make more measured decisions, or be truly fanatical. I changed him to be a rogue and it worked well. Second, in some of the fights, there are a lot of monsters (zombies in particular). We ran way over on time on this one, despite the fact that I did some DM "cleanup" when it was clear that the PCs were going to win the fight. Remember that Zombies have to be killed hard to be put down (they get a save to avoid dying and instead be reduced to 1 hp to fight on). This can drag a game on. Consider changing some of the zombies to ghouls and reduce their number. Lots of Kobolds later, as well. Fewer, more challenging monsters often means more memorable combats. Finally, there is some degree of confusion between "The Circle of Scale" and the "Cult of Dragons" -- make clear at the outset when running the game.
The trap rooms turned out to be a big non-starter because one of my players was an Arcane Trickster... mage hand FTW!
So, mixed bag to some degree, but again, plenty of fun to be had. The encounters offer some RP opportunities that shouldn't be missed. Remember, your PCs don't always have to kill baddies to overcome them. Encourage creative problem-solving!
PS -- Never figured out what the bag of chalk and scrollcase were for. Did I miss something?