I have all the DMT stones and I say, get one of the extra course models if you do any heavy sharpening. I use mine all the time, but then I think all factory knives have to be reprofiled. It seems to me that all factory knives have this steep bevel that has to be worked down before you can get that good, scary edge. Just make sure you have some of the finer stones to remove any scratches on your blade.
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Danbo, soul brother of Rambo