Just finished testing the new Treet Super Power DE blade....10 good shaves , shave #10 today showed a little loss of sharpness , but 10 shaves is good enough for me. The first 8 shaves were very smooth, no problems at all, shave #9 I could sense the blade was getting tired, and shave 10 was the last , no use stretching it out further...A very nice blade from TREET.