G**M
Best knife sharpener
I've had half a dozen of these over the past 10 years to sharpen Global knives, I also found it more cost effective to buy the whole product again rather than buy spares.
C**N
not so great
My knives were pretty blunt and this eventually started to sharpen them but took far more effort than suggest and even without overpressure I broke a wheel on my 5th knife. Replacement wheels pretty expensive. Bought a different knife sharpener with instant success. This one may work better with knives that are not as blunt as mine to start with.