I just tried my first pack of HF blades. One: they have a very oily finish on them. Yuck. Two - the first blade I tried wouldn't even cut a single layer of fabric cleanly. It would cut, leave a bit of fabric, cut again, leave fabric (hope you can visualize this). Even though I only paid $1.59 (had 20% coupon) for the blades, I will stick with the name brands - at least for now. Perhaps I will try them again. BTW - they fit my Fiskars, Olfa, Clover and generic 45 mm cutters with no problem and rolled in each one. They just didn't cut cleanly.