I have purchased HF blades from the get go, even before they started talking about them here. I have NEVER had a problem with them, (except the store keeping them on the shelf) and they last so much longer then the "name brands" for quilting. I have one on my cutter now that I have cut cardboard for the bottom of bags and went right back to cutting fabric. No problems. I am very happy with them.
And as many have said... Try them, you may like them and the dollars saved,...More fabric!