After my Sony Xperia cell phone charger broke, I looked around on Amazon for a replacement and found quite a few supposedly original Sony chargers. Reading the reviews it was obvious that most were not original, but instead were poor quality Chinese copies. Eventually I found a site that sells a German made multi charger from the company Ansmann. Costs around 22 Euros.
The charger comes with a two year warranty and has a USB 3.0 fast charger plug included. So far I've had my cell phone, keyboard and tablet plugged into it, all at the same time. Works perfectly, but gets a little hot while charging multiple gadgets...nothing too drastic though.