This will be a very unscientific review as I did not conduct any benchmarks.Purchased this card for my Galaxy Note 2 since T-Mobile only offered the 16GB version of the phone.Review:I researched this purchase prior to buying it on Amazon so I was somewhat hesitant to purchase this card and have to jump through hoops to get it recognized by my Galaxy Note 2.When the card arrived I immediately put it into my phone.  The card was instantly recognized and the phone booted up and mounted the SD Card without any prompting.Boot seemed very fast, faster than the stock card that came with my phone.  Again, unscientifically, this card seems much much faster than my old card.  All my movies and photos seem to come up quickly without much delay.My usable space reported is 59.45GB.I highly recommend this card to anyone.  It is extremely fast and very easy to use (for my Galaxy Note 2 phone at least).Pros:-Phone boots faster-A lot of space to store movies, music and pictures-Worked the first time I plugged it in without any special hoops to jump throughCons:-None