Over at sword forum international the leading past-time (sp?) is cutting plastic bottles. I took my 18" kobra and almost cleanly cut a 16 fl. oz. bottle in half. the cut went all the way through but the two pieces went flying. I still havent put its first edge on it. Any way, for those of you who have tried, how do knuks, the HI katana and the tibetan sword compare to the euro and japanese swords over at SFI?