If your using a DSi or DSi XL I would suggest getting an Acekard 2i. They are only $12 and with the AKAIO firmware it is the best card. I also have an m3i zero, it is not spring loaded so I need to be careful about not inserting the micro sd card too deep. It is also a huge battery hog compared to the Acekard 2i and there are quite a few problems with crashing when enabling cheats or real time save. Acekard 2i does not have real time save which is the only missing feature (it is a future possibility though), it does not work with most new games with the m3i zero anyway. I have never had to use what people call "the paper trick" with my m3i zero but I would still recommend the Acekard 2i.