I cant feel any quality difference between the stock keycaps and the pbt that is supposed to be a lot better.
All I can say is I love the red switches, even though they are not supposed to be ideal for typing I type better on these than the browns and maybe even the blues. Also the poker bottoms out so nicely I almost dont even want/need to do the oring mod. Spacebar, backspace, etc the larger keys that annoy the hell out of me on my other keyboards are so tame on the poker.