I'm not really sure why but at least for me I'm 100% sure they're a disaster. I was totally convinced mechanical keyboards were a million times better due to the hype and that they feel awesome.. after about 5 years of using them I was in serious pain and it was really hard for me to wrap my head around the Cherry switches being the problem. All the hype made it really hard for me to grok that when I went back to cheap scissor switch or rubber dome keyboards my problems went away.
I still have a couple of mechanical keyboards.. I started going back to the office and plugged in a Das Keyboard there because it was what I had... sure enough after a few days of heavy coding my forearms are screaming again. I need to force myself to get rid of the last 2 of these keyboards.
And I had a lot.. 3x Das Keyboards, Code Keyboard, Kineses, TEK. I can flip all the variables other than switch type and none of them really matter.. as long as it has Cherry MX Brown or Blue style I have issues.
I am kind of getting eager to maybe try some of the new short travel optical switches or something now that their are options other than Cherry style.