Here's a shocker for most of you guys.
I prefer the feel of stock keycaps.So I've gone through IMSTO PBT, GMK ABS Double Shot ABS, Vortex Double Shot PBT, Vortex Grey PBT Blank (Similar to Poker stock PBT), and in the end I went back to stock thin ABS keycaps on my Filco (MX Red).
I was trying to find the perfect keycaps but in the end PBT is just too harsh for me. I like how ABS absorbs a bit of the vibration and feels more "comfortable" to use.
Here is another unpopular opinion, I also like the feel of coated backlit keycaps LOLLLLL.
I like the feel of softer keycaps, if only this was more resistant to shine then it would've been perfect.