"A friend of mine, doing perception research in neuroscience, pointed out a keyboard they use in experiments with below 1 ms of latency: http://www.empirisoft.com/directinkb.aspx. It's not only claimed by the producer - they validated it, and the same tests showed around 8-16 ms latency for almost any other keyboard due to USB polling rate.
I was wondering if anyone had experience with gaming with ultrafast keyboards in games along the lines of CS?
Conventional wisdom says that it should make no difference, the same used to be said about monitors going above 60 Hz and then above 120 Hz and I am curious of hearing about the experience of people who actually tested them, preferably paired with high refresh rate monitors."
I dare you to find any real-life reaction differences between a cheapest membrane keyboard you can find on lowest possible refresh rate and ultra-high mechanical keyboard with 1000+Hz refresh rate on Red switches.
I double dare you. Stop believing in marketing gimmicks.
From my experience, the KB latency doesn't matter that much, unless it's really bad. Got my hands onto a cheap keyboard once (iirc it was Drevo-something). The delay is 30ms+ due to debouncing (or so they say in an official statement). It was quite perceivable in Quake. The QFR feels lightning quick in comparison (hence it's name, i guess?).