My wife bought me one of these 4 years ago. I tried using it but made a critical error as the directions suck donkey apples. Well I had about an hour to kill yesterday afternoon and ran across that thing in the barn. I took it out to the quackhouse and was determined to figure it out. I looked at the directions and finally found out I was putting the guides on the wrong side of the bit. I have a whole bucket full of bits from years of buying bits and hanging on to them. I got sharpening down to an art with that little drill doctor. I sharpened bits until I got a blister on my right thumb from spinning the bit guide. If you are like me and can't sharpen a bit freehand, I highly recommend the little drill doctor. The only bad thing is it only goes up to a .5 inch bit. If they have a bigger one I am going to buy it.