I bought 20 each of the red and blue, and they arrived today (about a week after ordering). They fit fine and look okay (even though they're "square") on my Filco, other than the obvious difference in height.
I mainly bought them to replace the legend-able keycaps (that I don't use) above the FKeys on my ricercar SPOS. Will do that swapout at work tomorrow, and post pictures. I've already replaced all the other keys on that board (that I could) with doubleshots from a G81-1800 w/MY switches.
I was sitting there at my desk at work with a keycap puller swapping things around, and a coworker comes in, "What the HELL are you doing?" "Oh, just swapping cheap keycaps for doubleshots." "Doubleshots?" and by then another coworker had come up behind him, and proceeded to instruct him on the differences, why they were better, and I laid out one of each on the desk to show the difference...