I purchased this for my Galaxy Note 2 since most other chargers don't have enough power. Before I got this charger, I could not use my phone for navigation or music while charging. My battery would deplete a little faster than other chargers charge. This one is great! It charges my large battery quickly even when being used. I took away the 1 star because, like a lot of other reviewers stated, the cord is very short. In my work car I keep my phone in the center console next to the outlet so it's not a big problem. But I had to replace my phone holder from the inside windshield to the front of the dashboard in my Suburban in order to use this plug and navigation at the same time. Overall, if you have a big phone like the Note (2, 3 or 4), this will charge it nice and quick. Just don't use it too far from the power source.Update: I purchased this August 2014 and it is now March 2015. This charger no longer puts out the 2.1 amps. It is only putting out 460 mA. My note 2 now takes 5-6 hours to charge. I tested my other chargers to make sure it wasn't my phone and they all still work at their max (1800 mA).