Seeing all the Modules needed, and the fact that the release has happened so fast we barely got any time to farm them, I have to say I don't find these items worth getting. Then there is Steel's potential, which is one of the worst in the game... if you get hit once, it all goes away, meaning only PERFECT players should ever use Steel. Literally the worst weapon series in the game as far as I see. If you can play perfectly, gratz on you, but 99.999999999% of players can't. I could out damage anyone with Steel using my Rivalrate on Phantom if they can't dodge 100%.
As for Klauz units, Trailblazer is almost as good in all three slots and infinitely easier to obtain. Given it is easy to hit 260+ PP with Trailblazer, I see no reason to bother trying to buy Klauz units. They only seem worth getting if you get a lucky drop from Primordial Darkness. It's the Modules, which you need dozens of but only get one at a time (three a week for Divide if you can do it enough). I can see how it worked differently in Japan as they had more development and farming time, but in Global, they just are not good investments when you can get something barely weaker at all for way less.