Rolling knife sharpeners - how useful are they?

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@dikman, good one. Informative. 

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I just got a rolling knife set - from Amazon  Vine. 

Only for kitchen knives. The set has 4 replaceable sharpening stones  360 and 600 grit diamond stones, a 1000 grit whetstone of unknown type and a 3000 grit ceramic. It allows 4 angles - 15, 18, 20, 25. They even give the type of knives which require specific angles.

Tried it on a couple of kitchen knives and it sharpens them well. A little stropping after and they are sharp enough for soft tomatoes.

It is actually easy and comfortable to use. Made of aluminium. Comfortable grip and large enough to hold firmly.

This set, at least, works well. 

 

[SUP]

Still using the above set for the ordinary kitchen knives - the ones I do not mind replacing. My Damascus knives? Especially the one that is truly layered and not painted or whatever is done to get those swirls? I do by hand. It takes time and is needed rarely, but too precious to risk on the roller.

For ordinary kitchenware though, the rolling set that I have is great. And the price cannot be beat - 80%discount when I am being honest, 100% discount if I did not want to be!