1) On one of the USB ports has been a great, scharferGrad, I had to remove only.
2.) The power supply is buzzing loudly the longer it is plugged in.
3.) - most importantly - I can load to the power supply neither my nor my Galaxy Tab 3 anchor battery pack with 10,000 mAh. I have now tried several cables, but the two devices can not be loaded! The Galaxy S3 my wife and my Galaxy S4, however, can be loaded without problems. Something seems as not to be in order with the assignment of the USB ports.
For points 1 and 2zusammen I have total deducted a star.
For the serious point 3 I also have a point deducted.
So 3 stars remain. And that's rated for the many and schweriwedengden problems, in my opinion, very good.