Chris G
I bought the 64GB version of this card to increase the storage capacity of my Samsung Galaxy S3.  I use it to store pictures and video which I shoot with the phone.  I have never had any issues with the card keeping up to the 1080p video that the phone shoots.Speed as tested on my Galaxy S3 w/ SD Card Tester:Write: 9.6 MB/sRead: 24 MB/s