But really, how often will you use it?
I use it for every quilt I make. I have the strip dies in every size. I can make a 6" wide border or an 1 1/2" wide border for a queen size quilt in one turn. I cut bias binding in less then a minute.
I have gotten one that was supposed to be a square but one dimension was 1/8" off.
I cut a piece of paper first with every new die. If the dimension is off I get a replacement. I check each new die this way. I don't cut fabric before I check the die. Many times the paper will be cut perfectly to size and the fabric will be off. I know then that the fabric is shifting. I either have the grain line in the wrong direction or the fabric is stretching due to low thread count. If the fabric is prone to raveling it will stretch. A piece of paper on the blade before the fabric will usually solve the problem.