I was given this card in October to add to my new Samsung Galaxy S3. I was thrilled I copied a ton of music onto the card and used my phone as my mobile Ipod substitute, leaving my Ipod Classic on my desktop in its speaker system cradle.Everything worked fine until a couple of weeks ago. I started getting messages that seemed to say that I had removed and inserted the memory card. Of course, I hadn't touched it. Then a few days ago the phone told me that the card contained unsupported files and that I needed to reformat it. Well, I tried reformatting. After that, nothing. Nothing at all. I pulled the memory card, reset the phone. Reinserted the card. Nothing. I tried the card in the adapter on 3 computers. It wasn't even visible.I called Sandisk tech support. It didn't take terribly long to convince them that I had a problem. But they quickly offered me two 16 gb cards as a replacement. I literally laughed at them. I got the disturbing sense that this is something that they are required to try. If so, that's a lousy business practice. After bouncing me around a few time, they agreed to send me an RMA and a shipping label. I duly sent the card off a couple of days ago. To be frank, I have no idea at all when I might receive a replacement.If I weren't already in the grips of Sandisk, I would buy another card. The fact that 10% of the comments here are negative is an indication of a real quality control problem. A 10% fail rate is simply unacceptable for a product such as this.Update: Well, I do have to give Sandisk credit for customer support. I returned the card using the supplied UPS label on a Tuesday and I received a replacement by UPS on the following Monday. That's very good service. It does, however, increase my suspicion about the offer of two 16 gb because the 32 gb cards were "out of stock." If they were out of stock, they sure got "in stock" in a big hurry. In any event, I've upped my rating to two stars.