
I first bought a 128GB UHS-I U1 card because I didn't realize there was such a big speed difference between U1 and U3 cards. However, the transfer speed seemed too slow when copying from my computer's drive. I had about 50GB of data from my old microSD card. It was such a big difference when I switched to this U3 card. Everything was secured in about 20 minutes and before I knew it everything was ready to go. I wish I had bought this card to start with so I wouldn't spend all my time copying data to a slower card. I highly recommend anyone who needs a 128GB microSD card to get a U3 card, it was a good buy.

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