I have the Silhouette SD (an older 9" version). The SD card lets you save the designs on the card so that you don't have to have it plugged into your computer to use it. If you have a laptop, then I'd say it's not necessary. I loved the convenience when I was offering some vinyl classes and some ladies didn't send me their orders on time, I saved the designs on my SD card and could cut them out right there.
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