Red switches are best suited for FPS gamers. These keys can be pressed quickly, and double tapping them doesn't require the key to come all the way back up - making them ideal for FPS gamers who need to rapidly press keys.
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Pro Very quiet
Because there is no click or tactile bump, the Red switch is the quietest Cherry MX switch available.
Pro No pressure point
Pro Minimal resistance
Pro Linear easy actuation
Con Mushy feeling
The Red switch doesn't offer any feedback (either audio or tactile), so they can end up feeling mushy.