Harbor Freight blades, did you notice they are circle in the center and the ones you buy from JoAnn's have a different center on them, that could be some of the reason. I have used both at different times, mixed emotions.

I have been using a Harbor Freight blade. I have made a queen size quilt, DP9 that I cut myself, 5 mug rugs, 2 clutches, a bow tuck bag. It is still sharp. Maybe you just got a bad pack. The blade I had before was an Olfa. The Olfa skipped and I had to recut over an over. You can get bad blades with name brands too.

Mine worked great. Maybe it was a bad batch. At the price it might be worth trying again

Perhaps we've been buying them up so quickly that the manufacturers have begun to go a little too fast in the process. I've had one that I had to throw out but other than that have had very good luck with them.

I bought some and the ones I tried were beyond dull. I was so frustrated, I didn't bother to open any of the other packs I bought. I'm not giving up but Yuck! It was awful. The bad blade I took out of the cutter worked better than the new Harbor Freight blade. With so many people using them, maybe there is hope the next ones will be better.

I just put one in the rotary cutter a couple of days ago. I swear I have never had any blade as sharp as that one. I haven't had any problems with any of them so far, but this last one was especially sharp.

I,m with you. I ordered 10 packs awhile back when they were on sale. They are horrible. I tried time and again to cut
with them and as you say, the one they were replacing it with was better.
I will never purchase them again.
I,m, just stuck with all these. I will go back to Olfa and Fiskars.

Me too. But even if you have to throw a few away, you are farther ahead than paying the outlandish price at the LQS or Jo-Anns.

Unfortunately I too bought 4 packs and have a horrible batch--dull, pulled at the material. Price was great, cut not at the expense of the accuracy of my quilts :(