I am using this pen-drive for 1 month and till now its working smoothly. There is no such issues at all as I have heard some issues with other. It works just what it mean to be. The data transfer speed is fast, around 21 mbps. If you do not have 3.0 usb port on your device then its hard to get this much speed.
This also works very well on Samsung Galaxy note 4. It detects the usb in no time. you have to just make sure your smartphone supports otg facility. Sometimes usb slider does not slide smoothly and gets stiff but that’s not a big issue. This usb device is perfect product in terms of innovation