well, it *SEEMED* like my reaper shotguns are landing "quicker".
mouse movement almost no improvement.
my monitor of course is just 60hz.
in perfect honesty, it could be just placebo, and of course as i'm no pro gamer or the sort, 5-6 ms from 10-12ms doesn't seem like a lot despite you could probably say "oh you reduced your latency/input lag by 50%/half!"
but 5 ms? i don't know man

not to mention, at over 200fps, once in a blue moon my screen would tear if i do quick mouse flicks/180degree turns and what not. don't forget i'm on 4k dpi/23 sensitivity on all my heroes lol.
i'll stay on this setting for a while and see if there's actual improvement in gameplay, otherwise i'll just revert to max all settings prior to tone down the fps to eliminate screen tears.