I took 800 grit sandpaper and a green stochbrite pad to the knurling parts only. This really improved the grip and gave the knurling a more defined appearance.
maybe be hard tell it in my pictures.
I see this is now being offered in either a cool white or neutral white.
This is how I permanently fixed the slippy grip knurling ...
I didn't see a separate thread, but they now have the TiS. It is the same as this, only with xp-g2. I just got the NW version from amazon. Beautiful light with a good tint.