Has the current standard ceramic Spyderco Tri-Angle Sharpmaker (model 204MF) remained pretty much unchanged since its introduction...angle, hone media, etc.) If they're have been any upgrades were they significant? I've got a trade pending for one and it may be an older version. I'm just trying to get up the learning curve...not worried about normal wear on the hones, which I realize could vary a lot. thanks