I have a Corsair k70 Mk. 2 with brown Cherry MX keyswitches. The brown switches are pretty quiet, but you still hear a harsh noise when the button is pressed all the way down. I work on the phone, so I get a lot of comments from people saying I type really loud. It stopped that tone without messing around with Key Moment or RGB, I don't even realize I'm wearing them. I haven't put them on all of my keys yet, and you can tell when I press a key without an o-ring because it makes a dull "tee" sound, while keys with o-rings make a nice "puff" sound make. I ended up putting two on the spacebar because I'm sure they could hear it on the space station, with two O-rings the spacebar is now the quietest key. Just keep in mind that this doesn't make your keyboard silent, it's just meant to stop the sound the switch makes when it's pressed. Depending on which switch you have, you may not even notice a difference (blue "clicking" switches) and may want a keyboard/switch that should be quiet.
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