i have to say that i am a person of habbit,why change something if it works. i use the same spiral blades since i started i tried different ones that i didn't really care for, so i decided to stick with the regular ones that i always used. well my last order mike sent me a couple of new ones to try, i have been putting it off to use them because i realized i don't like change, i finally decided to give them a try and i got to say sometimes change is good now i can't wait till my next order. thanks mike for introducing me to the new blades your the best.