This is in my top 5 favorite adventures for Adventure League. It feels epic, and if run properly has some amazing potential for really fun roleplaying in addition to the fun encounters. The only drawback I can think of is that it tends to run longer than the advertised 4 hours, taking up about 5 hours on average, or 6 if you really spend time fleshing out the NPCs.
* Spoilers **
The story takes the players from meeting with the city's head of clandestyne operations, to a grimy inn that hosts colliseum-style fights (to the death). From there, the PCs meet some of the city's underground players, a slimy and cocky fighter, and a cool dwarf gladiator. The gladitorial fights are really cool.
The story then expands into something of epic proportions, where the players have to brave a blizzard on their long journey into the mines, and they can stop at an inn, see gryphons flying, survive an avalanche, get attacked by Yetis, and confronting an army of dwarves.
The meeting of a dying dwarven king, getting involved in dwarven family affairs, and assisting a clan of dwarves in reclaiming their mine all expand the story and it leads to an awesome dungeon with truly interesting visuals and combats (the Boulette chase is phenomenal).
Pro tip: Run this, followed by "Sword of Selfaril" for an even more epic quest that will end with the player truly feeling heroic and as if they made an impact in the world around them.
Finally, the magic item (dwarven belt), is a fantastic item that help any character.
TLDR; This adventure is what D&D is all about.