Ive used a flat stone, and the G5 diamond stone. Both work but what I have been using lately is a little sharpener made by Rada cutlery. Its called their quick edge sharpener. The thing will put a shaving sharp edge on a knife, broadhead, just about anything thats made to cut with just a few swipes. Only cost like $6.50. Realy quick and easy to use. Works well on the montecs two for those who are having trouble getting them to shave.