Have this USB stick gifted and he behaves similarly bad as another. 15MB / s write rate ??? With me on average 8,5Mb / S. A Transend USB2.0 writes me with 13Mb / S deutlisch faster. Funnily enough, but he begins with 50-60Mb / s but breaks after 3sec and stays that way! Find him also not very well made, the rear part wobbles. Otherwise, it goes well.