The ability to resist deformation is the definition of hardness, and Nathan has demonstrated that his 3V heat treat will allow a knife to resist deformation better than the industry standard heat treat. Toughness is the ability to withstand fracture under impact, and I haven't heard anything about the fracture resistance of 3V with Nathan's heat treat. 3V's outstanding characteristic is having very high impact toughness while maintaining good wear resistance. With the current Survive heat treat 3V also has good corrosion resistance. I haven't heard anything about the corrosion resistance of 3V with Nathan's heat treat. Guy's corrosion resistance testing has been done by exposing knives to weather for months at a time, so his testing process takes a long time to be completed. I look forward to more information being added to this thread.