Pros: Extremely versatile and very simple. I bought it originally for travel but routinely take it with me to work. If you plan to use any usb powered device in an environment that may not provide charging opportunities than this easily takes care of the issue.

Cons: Being the 13000 mAh model, it IS slightly heavy and not always the most convenient thing to have in a pocket.

Overall Review: There are many portable power options at many levels of price and capacity. If you want the nuclear option than this is likely for you. I haven't found a better power capacity/density ratio in any other device at this time. Also price isn't that bad.

Pros: Works perfect. Allows usage of usb devices for my galaxy S4 device.

Cons: Had to shave off just alittle plastic from around the microUSB plug to connect it due to the diameter of my cases access for the port.

Overall Review: An absolute must have for any smart phone user.

Good price, quick delivery.