I am not sure what Sandisk's problem with compatibility of their product is, this product is rated only for microSDXC-compatible devices. I can't think of a single such device right now. I read that this memory card works on the Samsung Galaxy Note, and decided to risk buying it for my Samsung Galaxy S2 SGH-T989D (TELUS version of the T-Mobile Samsung Galaxy S2 - this is the exact same phone as far as hardware is concerned). Guess what: for the first time in 5 years, I can carry my entire music collection with me at all times! Not only did it work, it is recognized at full capacity. There are two caveats:
1) Formatting this memory card as FAT32 appears to come with some performance penalty: it took more than 3 hours to copy all my music into it. Even adjusted for size, this is a few times slower than what I was getting out of my trusty 32GB memory card. Early adopters beware.
2) Make sure you format this card with your cell phone. It comes formatted with a file system not currently supported by gadgets.
If you just want someplace you can stuff all your music for your phone or media player to play, this would be it. If you want performance, then you are better off with two 32GB cards. I can't tell you if having a microSDXC-rated device makes a difference in performance. Maybe, maybe not.