I am not happy with khitai weapons balance, cause I cant use iron at lvl 60, and still haven’t got into star metal. Latest patch changed balance of khitai to star metal, which afaik is still unbalanced, as more costly than other tiers and not as good.
So again, I am not very happy about the balance, its fine they are cosmetic items, but I would have used them much more if they equalled to reinforced steel (lower than star metal) or obsidian / dragon bone etc.
Honestly im only enjoying the building and decorations part on khitai dlc.
PS: Also, what Tim said above, regarding the stats, material costs, and improved recipes / thralls to make improved versions, as I would like to use DLC weapons for something else than placing them in the weapon racks xD