I recently bought the True Cut electric sharpener and am very happy with it. After each pass, you should clean the stones with oil and rub them with your finger (then wipe off finger) to get the grey metal out of the stones. Then one drop of oil on each stone to sharpen again. If you don't keep the stones clean and they get clogged with metal they won't sharpen well. The alternative is to buy new stones every time they are clogged.