Friction polish may not be a hard wearing finish but I have used it on pens for those customers who, over time, want to see the patina of the wood change, friction polish is ideal for this.
Personally, I also like to see wood darken with use and also like a nice shiny, hard wearing finish too, I prefer spray acrylic lacquer from Halfrauds etc. Tried the liquid stuff that Walter mentions but can't seem to get a decent finish out of it.