This 128-GB SanDisk microSD card is my 7th and I also bought 5 SanDisk pen drives. It is just the brand's quality and service experience that tempt to buy storage devices from SanDisk. Lets talk about performance, however to get fast speeds system must have right configuration. It never gave 170mbps read/write on my system but still it manages the speed in 140s, which is also good enough. I have to check speeds on other devices as well to check it top transfer speed. But for now after using and trusting SanDisk for so many years, I will definately recommend SanDisk micrSD card.