So... basically all the Su3 Weapons outside of the club and staff all have the same annoying property on them: they all drain 5% MP per hit to give you a chance of attacking twice.
So this means that anybody who has native MP who melees, such as DRK, PLD, RDM, or BLU are SOL here, because you're going to go dry after a minute or two of swinging, and won't have any MP to do anything else.
I'm scratching my head trying to figure out why anybody who has native MP would ever want to use these weapons...