So far, so good - I have used this for the last 4 days and have tried 3 of the 4 forms of charging - USB, A/C, D/C - all of which have worked just fine (on a Moto-Q).The small size and modularity of the device is awesome - just what I was hoping for. I love it when technology works as advertised. The only other thing I could hope for is longetivity out of the device - will post back if there are any issues in the future.