using it all day here and no pain so far.
It'll vary a lot for different users. I start getting wrist pain pretty quickly if I use it, and if I don't stop, it starts getting worse. I think it's because of the insanely short travel; if I type in a way remotely like the way I'd type on any other keyboard, laptop or otherwise, I'm hitting the end of the key travel with momentum, so there's impact.
I may or may not get used to it with time, we'll see. But I get the feeling that, no, this is just a really awful keyboard to type on if you have sorta shoddy wrists. Which, it turns out, a lot of us old people do.
I will happily spend $300 on a keyboard if it's pleasant to type on.
... Also, typing speed may be a factor. I type pretty fast, and this makes apparently-minor keyboard differences more significant.
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I type hard on my keyboards, and outside of the initial surprise of the clicky sound of the new keyboard, I'm perfectly fine with the new one. If any keyboard causes you pain from typing, you got bigger issues than the type of laptop that you buy.
Well, yes, but it turns out that the thing the doctor tells you to do for those issues is "use different keyboards". So, yes, those issues are bigger than the laptop... but the laptop exacerbates them. This is like telling someone diabetic that if sugar causes them trouble, they have bigger issues than whether or not there's sugar in their drink. Well, yes, but that doesn't mean the sugar can't be a real problem.
Previous macs were generally at least tolerable for me to type on. This is the first one that's been actually painful in a long time. (I think the Apple keyboards for the G4 towers or so were sorta horrible, but I didn't actually use them for any length of time; it's only on the laptop that I really care about the quality of Apple's keyboard.)