The card works fine with the Galaxy S5 (5.0) and the Galaxy Tab S 8.4 (4.4.2). Formatting was not necessary, the cards were immediately detected. In a device Available space of 119 GB is displayed. Previously I had a 64GB SanDisk with half as fast reading speed as this card here in two devices. I was beginning to think that the images are displayed faster now in the gallery (QuickPic). Subjekiv I can adjust any improvement there though. Perhaps the device can not handle the fast cards and are gegradet down ?? Nevertheless, I give the map five stars because it optimally met their primary objective of memory expansion. In addition, images were in other reviews already loaded high, showing that the card can achieve their specified speed.