Bought this a few months back for my phone... but after switching phones to one that didn't support extra storage I reformatted and stuck it on my car stereo full of music. Even at full capacity it has been there for months now playing without a hitch. Music only take about 5 seconds after starting the car to start playing, skipping, fast forwarding or searching all works flawlessly. The stereo is to be given some props here but if the card wasn't up to par it clearly wouldn't be as fast as it is. Very glad with the purchase. Will buy again if the need ever comes.