[mgrande]

Depending on how you use your kindle, you may or may not find yourself using lots of numbers. I use them all the time, which is why this lack of numbers over the top row became very annoying. Sure, you can count keys, but that slows things down. In theory we could get rid of all of the function key names, for example, on our home keyboards and just count starting at F1, but that is just not user-friendly. It's an issue of user-friendliness. Amazon dropped that ball on that front with the number keys.

I am more of a studier than a reader. I put technical docs and lots of pdf files on my kindle. pdf docs do not link correctly, and all you have to jump around between the pages is using page numbers. Counting keys in this case becomes very annoying.

As for other solutions, such as a sharpie or an etcher, yes they can be done. The problem with the sharpie solution is that it's not a polished solution. I didn't like the idea of my bad handwriting on the top row. It just looks bad. Etching is even more scary. One slip of the etch and it's aesthetically ruined.

These number labels are printed in the same or very similar font than the other keys. The color matching is close, so it has a more polished look than some of the other makeshift solutions.

One trick to applying the cutout label is not to stretch it too much since the sticker does stretch a little. If you do that, then the numbers line up perfectly. I've got one on mine and my wife's kindle, and it has resolved one of my main complaints of the K3.