my wife & I have EVO 3D phone , so I purchase this device , through she account , to charge from my Lexus rx400h . while some of the review say the device be cheaply construct , the one I receive appear to be make good enough to last . perhaps they have change the manufacturing process and be ship better item . I have see much more fragile car charger . my main reason for order this item vs the other available be the charge capacity . while EVO 3d be not the power hog of a ipad -lrb- which require 2 amp -rrb- the EVO 3d will charge faster if they have 1 amp . the phone will charge on the standard 0.5 amp of a regular usb port , it just take longer -lrb- overnight for the extended battery -rrb- . this unit appear to be charge we phone fine , and allow use they while charge . I still use Sprint TeleNav , even though the rx400h hybrid have a good GPS & map display as standard equipment . my only con be not that significant , but it would look even nicer if it do not stick out as far from my dashboard console . at first I think it be not fully insert , the outside ridge should go back so it appear insert correctly . while I believe the unit will be durable , it could be make stronger . a simple ring -lrb- metal , plastic or rubber shrink wrap -rrb- around the body of the unit would strengthen it considerably and provide the ridge mention above to make it appear insert correctly . I put a 3\/8 '' band of rubber shrink wrap tubing around mine -lrb- just behind the outer section -rrb- which make it look even better . ejt