cs katana is a nice sword to practice your skill, strength and overall agility. also a decent replacement for hacking tree brench when you do not have the right tool.
but truth to be told, it is by far nothing close to an effective weapon for self defense. first, too big to conceal. you will get shot before you can even get close. or before you can draw the 75cm blade fully out, punks will grapple you to the ground then more men come in finish you off with stomps and kicks. see, the better way to defending yourself is not make enemy fear you big sword, guns or nukes. that was the outdated ussr style(effective but not time/money worth). the better way is to smile at your foes, offer a cigarates or weed to them, then making them guess if you have someone aiming a sword, gun or even nukes beihind their back. come back from those war philisiphy, in real modern day selfdefense a revolver pluse bowie knife/peper spary combination would be perfered by me.
second, in case both side draw their sword already in a medieval duel style(lets imagin it really happened between 2 nerds in this 21th century day), cs katana is too thick and too heavy yet not long enough to offer you any technique advantage against your opponent. in such shitty situation, you want to deliver your target a disabling wound without yourself getting hurt. you do not need an over built unbreakable sword to cut your target in 2 like in those misleading movies or youtube videos. you want a fast, light blade to disable or kill your foe, at the same time strong enough to not break. a longer and thinner sword full of dents can still kill your target as effectively, but a heavier and shorter blade will have harder time hitting your target effectively.
acctrully i think you should buy a CS katana. its extra weight is excellent for practicing your strength and control of the weapon. that offers you advantage when you use lighter sword in a real duel in case it really happens. overly built blade will make it last longer than others in practice cutting.