well, it isn't a big problem for me as i only have my m3 in my micro 24/7 but for those of you who switch flash carts / originals / etc... you may find that the m3 perfect pushes the micro's pins too far up. it's a tight squeeze and i didn't think it was a problem until the other day i popped in my official yoshi's island cart... it wouldn't read. i tried popping in my metroid... same situation. i popped in my m3, again and it works. i'm guess the pins were pushed too far back... i'm very bad with explaining things so if anyone who understands me could just reply to this post for others to see, it'd be great. some people might not want their micro semi-damaged.