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F-smash is pretty laggy, and if you miss, you will almost always be punished by a good player. Only reckless players who just rush in will get hit by it often; otherwise, it's pretty situational. I'd recommend against using it too much--of course, if you have a fortress of grenades/C4s/etc. set up, then f-smash can work wonders against a cornered opponent (at the very least your opponent's shield will be destroyed, and if he tries to hit you out of f-smash, he'll probably eat a grenade explosion).