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I've been sharpening knives for the past few years with https://chefschoice.com/products/chefschoice-prontopro-diamo...

As far as I can tell it works great and requires virtually no skill or knowledge.

The downside of those is that they a) don’t actually create a very sharp edge, but instead create a “toothy” edge that can’t push cut, but can slice decently, and b) remove a lot of material, and thus shorten the life of the knife.

They are really good for a normal person to get a knife sharper than they could ever wish for. I've given one to all my kids as it's the only method for them to keep their knives sharp. It's a great tool for an everyday household kitchen.

They do have downsides and are not the right tool if you are intent on spending time honing your skill, that's not their place.

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