I used a Lansky knife sharpener that I made an adapter for to do auger blades and it worked well.
A lot of bad reviews for the Strikemaster sharpener, but that could be "operator error." Those sharpeners are made to be used in ONE direction and if used incorrectly they remove the cutting edge instead of sharpening it... Maybe good for on-ice emergency sharpening, but I don't like the idea of the carbide "sharpener" which will make a rough surfaced cutting edge that will wear quickly - I'd rather use stones.