For those of you who are on the fence, I'd say this is a perfect DLC for anyone being introduced to the game e.g., not in Kuttenberg yet.
This DLC will expose you to the likes of treasure hunting, riddle solving, RL lore, some (objectively) sexy looking armor than has several workshop mods to change the colors, remove the lion from the helm, etc. and navigating medieval era "maps". Maps is quoted because...well you'll figure it out.
If you love treasure hunting and solving riddles (without looking online for hints), then this one is for you. The treasure maps after receiving the first cache (there are 5 total) are well placed and sprawl all over the map, from northeast to the southwest of Trosky.
For those of you in Kuttenberg already, it doesn't hurt to pick this up for when you go through a new playthrough. The armor is top-tier relative to Trosky, mid-low tier relative to Kuttenberg, so it's not a "pay to win" sort of thing.
Another reason to buy it is to support the devs for such an amazing game.
If you are not interested in treasure hunting or are only set on doing a single-play-through and are already in Kuttenberg, then perhaps pass this one up.
I do recommend this, absolutely. Starting a new play-through and treasure hunting is very fun and challenging provided you've not already out-leveled Trosky.
JCBP