I got the Axgio PowerSlot L6U USB charger 2 weeks ago and it has been working very well. Before that I had tried a 4-port charger, which, with output current value of 1.5A, charged my full-size iPad very slowly though it dealt with iPhone and iPad Mini quite well. I got interested in the Axgio stuff when I saw it had an output of 2.4A though it is the total for 2 USB ports. I asked the customer service girl what the value will be If only one of them was working. She said it would be 2.4A if the device could bear the current. That made me pay the money. To be specific, the Axgio PowerSlot L6U has 6 USB ports which the seller claims can work at the same time. Of all the ports, U1 and U2 share a total output current of 2.4A; so do U3 and U4; and each of U5 and U6 have an independent output of 1A, respectively. When I had the charger in my hand, the first thing I did was to test it with my iPad 4. I connected the iPad to the L6U through the port U1, and my tester showed that the charger injected about 2A current into the device, or 2.2A when the display was awake. I was quite excited that at least my iPad could be charged at a normal speed. But the result posed a new question whether there was current left for U2. With the iPad 4 still on, I was trying to charge my iPhone 5. When it was plugged in, the charging failed with the iPhone keep connecting and disconnecting again and again. So I replaced the iPhone with a mobile power bank and was happy to see the two stuffs being charged simultaneously without any interruption. Then the current values for iPad and the power bank were about 1.9A and 0.8A, respectively, or 2.0 A and 0.8A when the iPad display was awake. That means the U1 and U2 ports have a max output of 5V by 2.8A totally, and thats why the U2 failed to charge iPhone 5, which can load a current of over 1.2A. In the earlier test, the iPad and iPhone totally required a current of 3.6A, exceeding the ability of U1 plus U2 by 0.8A. So the two devices might have fought each other for a full current and caused the instability. In the two weeks of real-world heavy use, the U1 and U2 (U3 and U4 alike) proved able to handle the iPad 4 and a not-so-demanding device easily. In fact, unless there is a full-size iPad on one of the U1 and U2, you dont need to be concerned over what to charge on the other port an iPhone 5 and an iPhone 4s can be charged very fast here. By far, instability has not been encountered when the 6 ports work at the same time (except in the condition of my first test), when the charger does not burn my hand. As a conclusion, Axgio L6U is very helpful despite that it does not look very good. You know, I have many USB devices and have been tired of plugging in and out. Now my iPad 4 and iPhone 5, my girlfriends iPad mini 2 and iPhone 5s, and some other stuffs dont need to worry about power supply even if all of them are hungry right now. You are referred to the video review I made with my girlfriend: http://youtu.be/W5qMoWpoakY And you can search Axgio PowerSlot L6U for the buying.