Instruct: Classify an Amazon review as either positive or negative.
Query: Knife Sharpener

I used to use a honing wet stone to do my knives and got this as a free gift with another knife set purchase. This is so much cleaner and easier to use and puts a nice sharp edge on my Wusthof Classic knives. You do see the metal filings coming off which means the blades are being trimmed down over time vs. using a wet stone, which just hones the edge, but using the steel keeps things in order for a while. I suggest putting a white paper towel underneath when sharpening so you can see/dispose of the filings. The verdict is still out how long the sharpener itself will remain sharp. I would buy this and recommend it.