Its very simple, hacked SJS can't be unsealed. They have no kill counter on it, the kill counter takes place of a spot that would normally used to add Enemy type % (native, A.beast etc) thats why a legit SJS can't have 3 monster % stats but only 2, 1 even if it has hit (I know somehow who legitlly found a SJS with hit).

If you have Action Replay though (AR) then you can hack one that DOES has the kill counter so it can be unlocked but the number of these SJS are limited online and you can never find out anyway. Just never accept one in a trade, if you see something that is so rare easily being traded its always a dupe or a hack.

Either way unsealing your found SJS is 100% legit. Sides its easy for people who are jealouse, cause they can't spend hours of their life to find the item itself, to say that something isn't legit becasue they don't own it themselfs. I seen it happen way to often myself sadly...You have no idea how often I got accused by people cause I have 2 Real Neiclaws of which 1 has hit and alot of other hard to find stuff like SJS and Guld Milla.

Now about the special, sure the it looks cool and its strong but it's not that usefull. I rather use my Photon Blast for Shifta/Deband since my Skyly is a Humar, and use a diffrent sword like Zanba myself. SJS is indeed better off sealed if you want to use it. Unreduced(?) Hell on a sword with also decent-good stats is awesome, specially in EP2. Aside that its good for shows and it looks cool (the special) but I also prefer the swords look more in sealed state. The black blade with purple seal just looks awesome.

TJS Is I believe the strongest sword in raw ATP. That doesn't make it the best sword though. Zanba with berserk easily outpeforms it, Flowen Sword (Yellowboze version) with Spirit outperforms it...heck even a Charge Calibur can outperform it in terms of damage.

@giga: Same special but much and much weaker. Also only HUcast and HUcaseal can use it. But yeah if you are a Cast and want it for the special then yes, Berdysh is a much cheaper, and easier to find, replacement.