I am not a sharpener! I've only tried once on some old Arkansas stones my Grandfather left me and it was a disaster (I used a crappy old knife thank goodness). I took my tanto Umnum to Blade this year to get it sharpened. The Wicked Edge guy (I wish I could remember his name...Gary?) said they were tough to sharpen without messing with the edge geometry. What he did was only sharpen the very edge bevel and left the majority of the tanto alone. Does that make sense? Anyway, he did a fantastic job and the only difference is now it's razor sharp. I have to get me a system!