Hmm, POM sounds good. But I don't think Cherry bothers with the expense of adding a protective coating, right?
I remember Rosewill has laser infill without coating, and it fades over time.
Filco has coating, and the legends remain bright.
The price is really excellent and tempting, but there should be two main factors militating against a purchase.
1) the modifiers for MY switches are incompatible
2) POM may be lasting but laser infill usually isn't, leading to keycaps without shine and without legends / worn off legends after a while.
But for that kind of price, heh, I'm tempted.