Its a little miracle! I've got a set of Wusthof knives that I've been honing using the round ...unfortunately possibly due to bad technique, they've never sharpened up as new ...now they have using this little blighter! I've tried other devices to sharpen the knives (I now know the difference between honing and sharpening ..) and they've simply not worked. They're now in the bin. This new one is small! It sucks onto the table top like a limpet. 4 or 5 gentles drags through the thing and boom , back in the room. So good I immediately cut my finger drying one on the tea towel . Can't say how long it will last as a device but for the money who cares?! It works and I'm back to perfectly angled sharp edges. Very happy.