This SD card USED to be one of the fastest. Now it is merely adequate.I bought the 64GB version and inserted into my Samsung Galaxy S5 (latest Samsung phone).The performance, although still adequate, is less than stellar. For example, to load the Amazon Kindle app, which is about 35mb and I purposely placed it into this SD card, it takes about 7 full seconds to load. The same app on my iPad takes around 2 seconds to load.Still, if you aren't too much into your smartdevice performance, then I wouldn't worry. But if you do care about how fast your smartphone can take pictures (assuming your pictures are stored in SD cards) or how fast your apps will load, then you should purchase a much faster SD card for your latest phone.Pros:1)Adequate performance.2)Hassle free packaging.Cons:1)Not the fastest, but still adequate.