I have about all the square dies for the Go. The only one that I use not being perfect is the 6 1/2" square die. The square cuts were coming out a little longer on two sides. I put a piece of thin paper on top of the die then the fabric and haven't had any more distortion at all. If you want a replacement die, if you bought it from a Accucut rep or Accucut a replacement die will be sent to you if you want a new one. I don't know how that works if you buy from JoAnn's or other non rep stores. The yahoo group has all the details about the square dies not cutting accurately and the fixes that work and what dies need to be replaced. My dies are from the first batch made to sell and have a different type of foam backing. The newer dies have a different foam and some think that is the cause. I don't know. This group has all the info you need about the Accucut machines:
http://groups.yahoo.com/group/accucutquilters/