I love them. At a buck a blade I can't complain. One blade was a bummer but in the trash it went. One lasted long enough for me to cut 5 layers of fabric for 8 yes 8 I spy quilts.
I have had brand name blades poop out after 20 cuts. No guarantee comes with HF, No guarantee comes with brand name blades except a call to customer service and then there is no guarantee, you would get a replacement.
So the message is just buyer beware for everything.