After purchasing three of these (one for myself and two for gifts to others) I read reviews that said they sometimes just quit, and it's difficult or impossible to recover data.  I have only been using my own card for 2-3 weeks, but it hasn't failed yet.3/27/13 after having this in my phone for almost 4 months, the phone started chirping every few seconds, telling me it was either mounting or unmounting a card.  The SanDisk Ultra 32 GB MicroSDHC Class 10 UHS-1 Memory Card apparently just decided to fail.  Thank goodness I only had info for one small app on it, and only need to access it about once a week, so it's not real critical.  Thanks to Amazon's 30 day return policy though, I will probably just have to eat the cost of this one.  Unfortunately, I read the other bad reviews about this product after I had already purchased mine (2 of them, but my wife's hasn't failed YET).  My advice is to stay clear of this product, and maybe SanDisk in general.