For those who found the cutting edge not sharp enough to their likings, remember all you need is a file. It might help to have a vice to hold the tool rocky steady. Then file the edges to be as sharp as you want them to be. The manufacturer likely doesn't but a really keen edge on it on the advice of their lawyers. Don't make it too sharp though with a thin razor edge as that will be dulled quickly when you whack tougher stems. A file is safer for sharpening than a grinder as it's too easy to overheat the edge with a grinder. Depends on skill level of the user.