There are not many guides talking about these keycaps.
I have been using them for months, I can tell you the PBT + POM looks brilliant on a backlit RGB keyboard.
The thing I like, personal preference really, is the font, and how easy it is to clean the keycaps and how resistant it is to food stuff.
But I wished they produce more colours than just black and white, honestly if they managed to do something like navy blue, royale purple and Ferrari red I would buy them in a heartbeat.