This thing works and charges our high-power smartphones (Samsung Galaxy 2 and HTC Amaze) quickly.  Can't complain.  It lights up to let you know it's powered but doesn't blind you with a giant, too-bright light.  Unfortunately, this thing is really flimsy and quite frequently comes apart when unplugging it from the car outlet.  I have to keep putting it back together (it snaps back together) all the time.  Be warned.