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there is no way that the two sides of this correspond to 800 and 2500. The DC4 has seen six months use, primarily sharpening the kitchen knives of friends & family, because the DC4 is small enough to have in my pocket and aggressive enough that it doesn't take long, and as they are not knowledgable about knives this is still sufficient to get it sharp enough to astonish them. (hey, if they're going to be making dinner and I'm gonna be eating it, this is a return favor which I can do while sitting in the kitchen and chatting with them.)
Even after six months use, The DC4 diamond side remains vastly more aggressive than a DMT Dia-Sharp Coarse (325 mesh!) of similar age. It feels similar to an Extra-Coarse. As for the ceramic side, it is also quite aggressive - I'd originally thought it might polish, but heck no. Comparing diamonds to ceramics is never an exact science, but it's definitely rougher than a DMT Extra Fine (1200 mesh) because I can get clouded-mirror with the DMT XF but it goes back to white metal using the DC4.
As for the CC4, similar story - http://www.cliffstamp.com/knives/forum/read.php?7,48582 has pics and goes into detail.
I like Fallkniven stuff, and their sharpening stones are great - just remember, they're smaller and coarser than you may expect.
P.S., yes, I clean my sharpening stuff properly.
I'm interested to hear your experience with CC4, thinking of ordering one..
Remember to keep it in the little leather pouch though. I left mine on a desk and then knocked it off by accident - it fell 3 feet onto wooden floorboards and broke in half. I still use it, but it was small to start with so having a 1 inch sharpening stone is a bit annoying.
Eraser works well for cleaning both sides of the CC4. So does AJAX abrasive bleach cleaning powder.