I use multiple USB devices. External 2.5 "hard disk, USB3 stick, USB2-Stick and an MP3 player (charging via USB) The Kindle would find still charging port his place, having to disconnect other devices without this purpose would be. the hub have been ideal.
But unfortunately the product very often loses the connection of devices. Mostly that is triggered by connecting or disconnecting another device. Sometimes a device is not recognized when it infects. In addition, I also noticed that the stroke in the device manager as "VIA USB2 Hub" is installed. Then, when connections are lost, the Device Manager also the symbol of the stroke is marked with a yellow warning sign and the reference text that is no longer functioning properly.
In short, the part does not work and returns. At 30 for a simple USB hub can expect that it works without objection.