After my D-Link DUB-H7 on my Raspberry Pi B + more and more mistakes caused (by back-powering), I opted for this stroke as a substitute. The processing of the stroke is good, but could be quite high. The power adapter and the included USB cable act but very stable and of high quality. The black stripes on the image below the logo on top of the unit will light blue illuminated at power. The power supply provides 2.5A current and can me easily the Raspi itself, as well as a USB hard drive, providing a wireless keyboard and a receiver. Most important: It supplies the Raspi not from behind with current (back-Power).
All in all a wonderful hub for use on the Raspberry Pi (B +).