I used one of these a few years ago and had good results. The only tricky part of using them is the distance the drill must overhang the holder. The correct distance is related to drill diameter, so it is different for practically every drill you would sharpen.
I quit using it when my flat abrasive wheel decided to fall apart. Replaced it with a Drill Doctor. If anything, it is a bigger PIA. Can't figure out why it sometimes insists on sharpening with negative relief. It is handy to establish the drill center after I screw them up while hand sharpening. Guys that insist on everyone hand sharpening should understand not all hand/eye coordination is the same across the population. Yes, I can hand sharpen a drill, but believe me, it gets ugly.
Bill
I quit using it when my flat abrasive wheel decided to fall apart. Replaced it with a Drill Doctor. If anything, it is a bigger PIA. Can't figure out why it sometimes insists on sharpening with negative relief. It is handy to establish the drill center after I screw them up while hand sharpening. Guys that insist on everyone hand sharpening should understand not all hand/eye coordination is the same across the population. Yes, I can hand sharpen a drill, but believe me, it gets ugly.
Bill