I like a new blade every shave, I tried most of the blades made, persona,feather,astra,derby and quite a few others but I have really tough hair I can dull a feather in 2 shaves so now although I like the astras a lot most of the time use a dorco blade one time only, I buy a 1,000 at a time so its really only about $80.00 for 2 1/2 years of blades