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The 20k will give you a better, smoother shave. More comfortable, in my opinion. In order to give you that you need to have the razor "ready" for that stone. It will take that edge to a higher level....

I have one and besides it being expense, i find it was worth the money. That said, opinions will vary because of the cost. ie. is the improvement worth the money. Again to me it was but i will add a...