I've also got one of these, but I'm really not sure if it's a real one or a fake one, either way it was terrible. I replaced it with one of this Mino-sharp mini water wheel sharpeners. That was a bit better, but still not great. I finally bit the bullet and bought a couple of proper wet stones, which are a thousand times more effective (fictional statistic btw). Take a bit of getting used to, but definitely result in a much better edge.