It's my understanding that the only difference in the 05 and 06 tricks are the blades on the 06 are being machined in Germany and are suppose to be sharper. I've also been told that the 06 blades willfit the 05 ferrells.This will be my first year trying the tricks so i can't comment on the sharpness of the 05 blades. Ican say however that if there was a sharpness issue it was addressed becausethese 06 blades that i recieved last week are very very sharp. First thing i did was take one out of the package and run it across my arm and the hair fell off with very little effortlikei was using my shaving razor. I still haven't had the chance to shoot them yetto see how they fly but i plan to this weekend.