Unicorn.Sendres: This is just the base Kurodachi, the final upgrade leaves it with: DMG68 & Delay464 so only 2STP needed for 6hit & 29STP for 5hit. Sword Strap knocks it's delay to 450 btw.
43% More WS but 23% less damage than Hagun overall, which is a big improvement overall except Meditate /THF situations.
In response to your Hagun comment Myx. There is finally an answer to your prayers. A Great Katana you won't need to buy gil or join a HNM shell for.
After Trial 654:
Assuming Joyeuse double attack rate, adjusted DPS is around 11.25. Not to mention, a 6 hit build will only require 37 STP, compared to the 46 needed with a 450 delay GK. This means you will not only be able to focus gear more on damage (or getting a 5 hit build), but will also be weapon skilling 1.45 times more than other GKs. Bye bye Hagun.
Yeah this allows you to WS with greater frequency, but it won't have the same punch as a hagun. I'll stick to my "old reliable" giant meat cleaver thank you very much.