I signed up for the Lenox blade freebee a few month ago and got it in the mail last week. I have to say it's the best utility blade I've ever used. I just pulled up the carpet in my family room to put down laminate wood floor and it held strong throughout the project. Cut through the carpet like a hot knife through butter, and did an even better job on the padding for the wood planks. I think the coating stuff they put on keeps the blade sharp longer.
I have no idea how much these blades cost compaired to others so it's hard to say if I'll go out an buy the same replacements, but I'll sure check them out.