I REALLY hate how everyone on "WS Trial forums" never really make ANY effort to review the actual weaponskill you're unlocking. What kind of DMG does it do? IS it worth the effort? Well, after spending quite some time on this WS, I finally got it, and I have to say, I'm TERRIBLY unimpressed. STR and VIT are supposed to be major modifiers for this WS(50% each)... so I geared myself with STR +37, and Vit +25, which I feel are VERY respectable numbers. Also, Considering I'm Elvaan, I dont exactly LACK STR or VIT to begin with...
I tried this ws on "Too Weak" Mobs in Western Altepa Desert using Gawain's Axe (Dmg 91, which is pretty RObust), and I was typically doing 480-600 with 100% tp, or 800-900 with "Sneak Attack + Steel Cyclone" with 100% tp. To me, this is RIDICULOUS, because I can do more dmg WITHOUT SA as an RDM on an EVisceration WS <.< In any case, on the BRIGHT side, I tried this on VT/IT mobs, and it seemed to have about the same resulting dmg as it did fighting "Too Weak" mobs. That kind of confuses me, considering the higher level mobs are naturally going to have MUCH higher defense (yes, mobs defense and your attack is ALWAYS a factor on WS's, not just the base stat modifiers), but I wont complain about it.
The ONLY thing I can see this being good for is if you are war/thf and doing an HNM/God, and you dont want to feed it lots of TP by dual-wielding weapons and using multi-hit weapons skills, because steel cyclone is a single hit WS, and does DECENT dmg without feeding a lot of TP. The other nice thing is... if you wait until 300% tp, this ws does a LOT more damage (3.00x normal dmg modifier), but honestly, who really waits for 300% tp?! @.@ All in all though, for MY purposes as warrior, I think this ws was a complete waste of time to unlock, and unless you do TONS of HNM as war/thf and have a 75 sam thats a good friend to help you unlock it, then I wouldnt bother.