Best sharpener for any straight edged Benchmade is a Fallkniven D4 diamond ceramic sharpener. Followed up by a quick strop on a leather belt. I do all my knives with it.

Did a little demo today at work involving a Benchmade 721 (Mel Pardue design) Axis lock, 154CM steel and a sheet of A4 copier paper. Sliced it right across, edge to edge, Rambo fashion. Using fingertip pressure on the knife.

I was demonstrating that a properly prepared knife is a lot sharper, more durable and safer than the Stanley (craft) knives that most of them use.

If the knife ain't sharp the paper will buckle rather than cut.