That is a quick way to sharpen one, but also a quick way to wear the blade away. You don't remove near that much with each sharpening with a steel or stone. You get a sharper edge also with a stone. Assuming you know what you are doing.
I 'steel' my kitchen blades after using a Tormek to correct them usually, these 'sharpeners' are fine for severely damaged blades and cheap pocket knives.
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