I just got a Gemini Jr. and tried the machine's cutting plates, which warped immediately. Then I tried the self-healing cutting plates from I-Crafter which were recommended. They didn't warp as much, then I saw the video on Magic Mat, so I have given it a try. Excellent product, and nice to know I can heat them up with my heat gun if they warp, which they haven't yet. Definitely a 5 star product.