What sharpening method do you use?
Generally speaking, you want to ensure that they aren't using a method that will cause the blade to overheat and lose it's temper. More knives are ruined from misuse of overly coarse belt sanders and rough grinders (heaven forbid) than anything else. Choose a knife sharpening service that goes to great lengths to eliminate heat buildup and removes a minimum of metal to preserve the life of your knives.
That being said, bear in mind that it is the operator that ultimately controls the finished product rather than the sharpening device itself.
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