I've been looking at some of these blade grinders online and got a thing in the mail from Magna-matic. I was wondering what's the differnce and benefits versus a steady hand and a regular $75 bench grinder? I am always big on really sharp blades and would like to do anything to improve the sharpness of my blades and to help the tip last longer but $600? Kinda a lot of money however, I do sharpen a lot of blades on a weekly basis. Any input or advice?