I got a few of these in a sample pack and was really impressed with the performance. They seem very sharp yet give a comfortable shave. At least 8 shaves on the same blade so far and it's still going strong. Then I checked the price for a 100 pack. I think I read somewhere that there's a much cheaper Personna blade that's identical other than it's not sterilized. Anyone know what these blades are and if they actually do perform as well as the Med Preps?