Brought bisherr not the desired

I hoped by this product a greater throughput for my USB 3.0 drive. Win 7 seems to not to be able. The panel initially reported constantly off and back on. After research, I learned that I should do a firmware update. Which I did. (That's why I have not sent the card back, because I have already changed the product.) The stability is better but the effect described still occurs. Throughput is also less than 50MB / s when copying an SSD. Named in various forums SuperSpeed ​​drive has Windows obviously do not want the install Device Manager. I think that this is the reason for the poor performance. Conclusion for me: The card is unusable.