Have to jump in here and add that since I have been using Harbor Freight blades in my Olfa 45mm cutter I have not noticed any difference from when Olfa blades were affordable. Hearing about HF blades on this board has been the most cost-effective thing I have learned on here. I order them online at 20 packages at a time. Have yet to go through my first order, and that was over a year ago! I just wished HF sold 60mm blades. That is my favorite cutter.
Result: more money to spend on fabric! LOL