I actually purchased a little box of them a while back -- they may have been a marketing trial. I haven't used them yet, because to be honest, most patterns where I'd use a 2.5 inch square, I'd strip piece. But I do think there is a market for the, particularly among new quilters who are not versed in strip piecing and rotary cutting. I will probably eventually use mine to make something like a saw tooth border.
RST