2 months in and my keyboard is bent. That is probably too late for an exchange.
As the keyboard has been sitting on a flat service ever since I acquired it, this is clearly a design flaw.
At this point it is fully functional, i.e. no wiggling or noise yet when hitting the ends.
Still very disappointing.
Much ado about nothing.
Apparently the Magic Keyboard has a very gentle convex design for the bottom. But it is not bent. The case is designed that way and you will never even notice it unless you carefully examine the bottom of the keyboard from the side. Then you will see that it is ever so slightly less space between the desk and the center as opposed to the edges. However, measure the height of the case at both sides and center and you will see that the center is about a half a millimeter thicker. The keyboard sits perfectly flatly on the pads and most importantly, the TOP is perfectly flat. Get a long ruler and rest it on top and you should see no spaces underneath.
I think people worrying about this are the bananas.
After reading posts in this thread I took a look at my keyboard, and yes, I see that there does seem to be a gentle convex shape for the bottom.....and the thing is placed on a glass workstation, so no issues of unevenness due to the underlying surface. The keyboard feels solid under my fingertips as I type. Since my keyboard has been working just fine since the day several months ago I brought it home and set it up, I am not going to be concerned about that convex bowing.....as long as there doesn't eventually develop an issue with it rattling and/or every time I type, it begins to rock ever-so-slightly back-and-forth.....THAT would be unacceptable. I'll stick to what I have now, which is working just fine for me, unless and until actual problems emerge, and then at that time I'll trot over to the Apple store and say, "hey...."
Hopefully Apple is addressing this - whether that means recalling a batch of lots with bad heat treatments, or redesigning the keyboard if this is in fact a design flaw that affects all models.
I hope the new ones come out before my one year warranty runs out to exchange it.