Are these any good? I know that hand sharpening is a time tested good way to do it but I like my accurate old LoRay (Lansky type) and don't mind all the parts. It doesn't take even my half-brain to put a decent edge on a blade. I bought the diamond one because I need a distraction, and sharpen knives for friends that are in bad shape. The knives, not the friends. As far as I can tell. I also am pretty hard on edges with my cardboard cutting job as a packer and shipper. Can anyone tell me how long they last and will they rough out a bad blade quicker than a stone enough to make a difference? I would appreciate any advice or Lansky tips before it arrives next week. Yes I am new here, yes I tried to go back through all the past posts but gave up due to time, and no I don't want to hear about how real men only do it with someone from arkansas.