I enjoyed watching the video. The last time I purchased rotary blades at my LQS, the owner suggested that I should get a blade sharpener to save money. He said that they sharpen the blades they use in the store. After seeing how often I am changing blades, I think I will get a sharpener. I doubt if the blade sharpener he is selling is the one in the video; but I'm definitely buying a blade sharpener of some kind soon.