You won't find a more powerful USB charger out there, at least not at the moment. This provides dual 2.1A USB ports, while most others at best offer a single 2.1A port plus a 1A port. You may not NEED dual 2.1 ports, but this is the only device to offer it. I use this (and a charge-only cable by Mediabridge) to charge my battery-hungry Nexus S while I'm driving from one work site to another, and it charges notably faster than my 1A Motorola chargers. Another nice thing about this one is the form factor. Most of the other high power dual port chargers out there are HUGE, sticking at least 1.5 to 2 inches out of the 12V socket. This one will fit flush in many sockets, but sticks a quarter inch out of mine. Very compact. I currently only use the one port on this, but bought it to future-proof myself a bit. Speaking of which, I guess this means I need to buy a Nexus 7 or 10 to utilize that other port! ;) (Posted on 3/5/13)