I type a lot; I am writing my PhD thesis and do a lot of coding. I have developed pain in my fingertips and joints after about 1 month of use. It has become so unpleasant that I feel forced to use an external keyboard as often as I can.
An another note, the keyboard has started to fail and some keys are unresponsive or register inputs twice (seem to be jammed). I will have to send it in for repair and be without a computer to work with for almost a week.
Here is a video of the keyboard issues:
(On another note, I really like the machine otherwise, especially the form factor. But the Touchbar is absolute junk - it slows me incredibly down and I have yet to find a single use case for me.)