I don't have one but my wife's new laptop has the keyboard. I really hope we don't have to deal with that.
He took it to an authorized service center and the solution was to replace the entire top case assembly. That includes the case, keyboard, touchbar, trackpad, battery, and I'm not sure what else.
It's out of stock on PowerBookMedic, but their price on this part is $800. Eight. Hundred. Dollars. For a single broken key. This is insane.
I have a 13" version and I'm very concerned. I've got Apple Care but I'm careful with my laptops and I expect them to last more than 3 years.
http://www.powerbookmedic.com/MacBook-Pro-15-w--Touch-Bar-To...
Her past laptop was $1,100 (2010 MacBook Air) and lasted 7 years. If this one ($1,500) doesn't last that long, it'll be a waste of money.
FWIW my friend's replacement was covered. Not sure how much of that is the shop's judgement on "well you shouldn't have gotten dust in it."
And let's not even get into the "Touch Bar". Just stay away.
I also have a 2016 MBP with tb and it's the best hardware I've ever used (and that covers hardware since the Apple ][). The TB is very innovative and handy and the keyboard is pretty good.
People who don't have issues just don't post - the few that do are not a representative sample.
I miss the days where there was a separate line for consumers/professionals. A lineup of slightly thicker laptops with I/O for days and a lineup of thin-light for students and the light would be ideal.
But instead we'll get touchbar 2.0. yee yee.