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A while ... more than a year
I also like MX blacks. And greens. And a bunch of other switches. Not MX reds so much though, he said, typing on them now, and pressing the wrong keys all the time because they are too easy to press.
If you like MX blacks, no reason not to stick with them. Or if you like how stiff they are, but want a bit of tactile and audible feedback, try MX greens.
Or go for something radically different, like a Model M, or a Topre board