I've read that natural nut butters respond better to an up-and-down motion than stirring. I noticed they have two versions of this tool, one of which provides that motion. It's really hard to duplicate that motion without a special tool so I can't really say if it's better. I've tried to mimic it but haven't had much luck.

Have you a good food processor? Nut butter is easy to make, and cheaper, if you've the inclination. I had to stop making pecan butter as it's like crack to me (all nut butters, really), but it does allow the ability to try different things.