Just received a Tai-Bao set. Supposedly double-shot PBT and with the antibacterial coating. The coating results in the keycap surfaces having a very unpleasant feel -- not at all like uncoated PBT from any other manufacturer that I have tried, including Ducky, IBM, Imsto, Keycool, Leopold, Topre, and Vortex.
I have considered trying to remove the coating, but I think I will return them instead and use higher quality caps from another company that does not use an antibacterial coating.