Forgot to mention... on Karsten's site, upper left corner, click on 'For Sale: View Available Items' to see his cheekpieces.
I prefer the model 'B', as I like being able to loosen two knobs and slip the cheekpiece down for cleaning without having to use any tools (like the other Karsten models or Shawn's DE cheekpiece). I also like to be able to tweak the cheekpiece height in the field, depending on the terrain, etc (i.e. steep angles sometimes demand a little different set up than flat terrain) if I have the time. Personal taste thing again - being 6'5" very few stocks fit me well to begin with, and shooting NRA HP long-range Prone got me spoilt about adjustable cheekpieces

If Kevin offered a thumbhwheel cheekpiece I'd probably go that route; as it is I like the saddle style better than the two thumbscrew style he uses now. Other people like Terry Cross's design (don't have a link, but if you search around you may be able to find it).