Over the years,I've tried various rotary blade sharpeners with very little luck until I tried the electric True Sharp brand and I've had good results. I also tried the blades from Harbor Freight, but they did not work for me. Then I found out by accident a very good quality rotary cutting mat is the key to keeping the blades sharp as long as possible. I found mine as a show special at a quilt/sew expo. I don't have to change or sharpen blades as often as before.