Anyone used one of these . . . looks similar to the Granberg sharpener. I'm sharpening my chain by hand, but it's still not sharp enough for my liking . . . of course if I had not attempted to saw through a rock a week or so ago . . . .
http://www.oregonchain.com/homeowner/products/accessories/sure_sharp_barmounted.htm
http://www.oregonchain.com/homeowner/products/accessories/sure_sharp_barmounted.htm