We have the first prototypes and have tested them well.  The first test was on several 2"x 4"s standing up and split them with no marring on the blade.  The second test was on a 2"x 4" cross ways resting on a solid rest and striking straight down.  It did not cut all the way through, but it did cut deep and again did not mar the blade or edge.  Then the ultimate test was Steel-to-SteelSM, with 9 good blows. These tests resulted in NO breakage or looseness developing in the blade, tang, or handle of the swords.