I must admit that I have never used anything but 24 kt kits. I have heard many of the advanced penturners degrade, denounce, and snicker about this plating. I am quite certain that TI, Chrome, Platinum/rhodium are better than Gold. Gold is a soft metal, and will show wear eventually. I think that sometimes this wear is exaggerated. I have read some people say they wiped the plating with a diaper, and it wiped off. Russ, who I deeply respect as a penturner, just claimed that it will last for weeks.
I made a keychain pen with 24 kt plating back in December. A keychain suffers abuses that most pens will never see. It is constantly being rubbed by metal. I have my ATV key attached to this pen, and used my ATV for doing countless hours of snowplowing this year, sometimes at subzero temps. I have hit the trails, with this thing bouncing around. This pen has been run through the mill.
It shows some wear on the key ring itself, and to a lesser extent, the cap that the ring runs through. It still looks quite nice though. The gold plating covers a shiny silver metal. Even with the wear, when compared side by side to just silver colored metal, it is easy to tell which is gold.
I will eventually try some of the other platings, but I don't see anything wrong with using the economical platings.