Bests & Worsts Reviews from Amazon

This HDE 4-Port Wall to USB Travel A/C Power Adapter Charger seems like a great deal since it is very inexpensive, and offers 4 USB ports rated "up to 2.1A max". What is not explained in the product description is that: the 2.1A rating refers to the TOTAL current from all 4 USB ports. I tested the output current of this wall charger, using the PortaPow USB Power Monitor. The first thing I found was that it was unable to recharge my Barnes & Noble NOOK HD+ Tablet (which requires 2A) at full speed. It does not matter if I use the two ports labeled `i' (for Apple?) or `G' (for General?) - the results are exactly the same. This is disappointing, but at least it was able to recharge my other tablets at up to 1.5A each. I then connected two tablets plus a cell phone to this charger, with a combined current of 3.5A. Everything appeared to be charging just fine initially. After less than one hour, however, the blue indicator light on the charger went out. I removed the charger from AC socket. The unit was very hot and there was a strong odor of burnt circuit board. Evidentially, the power converter overheated from the heavy load and burned itself up. I cracked open the case and found a damaged THX203H control IC inside. This IC is rated for 12W continuous, 18W peak output power. That explains why it was able to supply 3.5A for a short while (5V * 3.5A = 17.5W), but eventually burnt out. Bottom Line: The rating of "up to 2.1A max" refers to the TOTAL output current from 4 USB ports. That means if you connect 4 devices to this unit, then each device is only allowed to draw 0.5A. Conversely, if you connect an iPad to one port, then you are not allowed to use any other ports. In any case, I find it inexcusable for an AC power converter to have no thermal protection. So I cannot recommend this product. [Update on Aug 9, 2014] I tested the Poweradd 25W 5V/5A 5-Port Desktop USB Charger, which is able to deliver 5A total output current. It has one and only one port capable of charging my Nook HD+ at 2A. Read my review on it for details: http://www.amazon.com/review/RPVC2UQAF1PV1/