A standard when it comes to high capacity mobile memory.  Grated, if you have an older android phone, or older tablet, you probably won't see much difference.  But if you have a modern device like a galaxy s4, or note 3, or equivalent mobile device, you'll definitely notice the difference in data transfer and access in your device.  For modern phones, a UHS-1 memory card is a must.  The only reason I didn't give this product five stars is because it's not a sandisk extreme, or a sandisk extreme pro.  But then again, you must have EXTREMELY specific needs to want to get 85MB/s transfer speeds on a mobile device.  For movies, music and apps, this one is more that adequate.