This type of sharpener is only suitable for knives with edges sharpened from both sides. It is NOT suitable for knives sharpened form only one side (Japanese Sushi Knives, Scissors, etc.).
Also comes in Red/Black.
I purchased this sharpener to take care of a professional knife set I have ordered. That particular knife set has not yet arrived, but I have sharpened my old mixed bag kitchen knives. Each of the various types and styles of knife quickly reached a very impressive edge.
This is a particularly useful sharpening system, as it has 3 wheels (Coarse, Medium, Fine) Simply running the knife over the wheels 10 - 20 times Is sufficient to give a superbly sharp edge.
You will only need to use the Coarse wheel if the knife is badly blunt, for the most part using the Medium, then Fine, will suffice.
There is a 2 wheel version available without the Coarse wheel, costing a little less. However, even if the Coarse wheel is only used occasionally, I feel that this undoubtedly makes its presence worthwhile.
The sharpener is of solid construction, with rubberised hand grip and feet, helping avoid slippage (a GOOD thing when sharpening knives).
Filling the reservoir with water both lubricates and cools the sharpening wheels when in use.
The guiding slots are wider than most knives, which can lead to the knives sticking if you do not line them up properly (This worsens if using too much pressure). If you simply allow the knife to gently find its own position as you draw it across, you should have no problems.
Avoid pressing too hard on the knife, this can both damage the sharpening wheels and make the knife stick. I find it best to basically let the weight of the knife blade do the work, adding very slight pressure with my index finger along the back of the blade, adjusting slightly to try and maintain even pressure along the entire length of the blade stroke.
You should quickly become used to the correct noise the knife makes, if using suitable pressure. It will sound like a definite grinding stone on stone if pressing too hard. With correct pressure it will sound more like brushing a stone with a tooth brush (if edge is nicked or damaged this will interrupt the sound).
The sharpener cleans easily under running water, as the clear cover/guide lifts up and can be left to drain/dry naturally.
When (or more like if, unless you use very often) the wheels wear out it is possible to buy new wheels without buying the entire sharpener.
A little more expensive than some alternatives, but good quality and worth the price.
It is worthwhile noting that some of the "High End" Professional quality knives instruct you NOT to use steel Sharpeners. However ceramic sharpeners such as this are suitable for ALL makes of knives.