I use them a lot to sharpen my planes, chisels and folding knives. Mine have worn to the point where they don't cut as quickly, but still work great and show no signs of damage. The only criticism I have of them is the reversible design itself. In hindsight, I would have preferred not to wipe the plate while sharpening or flip it to move on to the next grit. That being said, the fact that they're mounted with tabs at the end at least gives you a good way to grab the plates if you need to move them.
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