- For me, I'm not sure I would ever not have blanks on current and future boards. The cleanliness and minimalistic nature are far more preferable to me than any type of legends.
I'm with divito. The minimalism of the blank caps for me trumps anything. It took a bit of learning how to pick out a single letter when I didn't have my keys on the home row (comes up all the time when selecting tools in Photoshop while using my Wacom pen tablet with the other hand), but after a week or two I picked it up. I just memorized the relative position of my most commonly used tool shortcut keys with respected to the nubbed "F" and "J" keys.
I liked the white and gray best too at first, but there were two things that made me switch to the gray and blue: with the low cherry profile of these caps, you can see the gaps between the keys a bit more than can you can with OEM kaps, and the stark luminance contrast between the white keys and the deck of the keyboard only exacerbates this. Here is a top-down image to show the gaps issue a little more clearly:
Secondly, as isaske points out...
Yes, not sure why. Is that the WHITE white or the beige white?
The white isn't super-pure bright white. I wouldn't go so far as to call it beige, but having it against a black keyboard with gray keys made the white caps look—I don't know—a little dirty, perhaps?
So, ultimately I chose the gray and blue combination as my favorite (for the moment anyway), since it tends to mitigate the above issues most.
