Perfect, irreplaceable, but manual!.

In fact, everything depends on what one seeks:
- Electric or supposedly miraculous thing that sharpens evil, without duration, without effort?
- A stone sub-called new-generation, same brand, which is useless if one does not know to use it?
- OR product.

I bought this trio spyderco there three years, and I do not regret my purchase ..
Certainly it is manual, a little long in each knife, but the result is very, very satisfying.
To be honest incomparable.
Quality knives, blades become sharp, and remain long.
Tested with steel Opinel (440A, 440B), Laguiole (440C and 12C27), the hard steel S30V, and a Japanese knife (steel?).

Perfect since we have some time to spend with his knife (on average 10 minutes per blade).
If you do not like your knife, forget it.
Otherwise ceramic wash easily with a sponge and washing up liquid.

I am difficult in this area, but if I had to buy another sharpener, it would be the same, if a little expensive.