Pro Great sound quality at lower volumes
The Soundlink Mini uses software to make sure there is no distortion on the device meaning that when you go louder the software will quit the music some, which makes for a more even sound, though means that you can not go as loud as some other devices.
Con Proprietary charging port
The charging port is proprietary, which means you need to carry around the charger in order to charge it (instead of using a standard mico usb which is often used in electronics now). This also means if the cord is lost another will have to be purchased, which will be hard to find and costly.