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The slim-long shape is literally the best one of all other charge sizes. It fits in LARGE pockets (coats), but most of all it fits nicely in bags. My girlfriend was often complaining about our other charger as being too bulky and square and adding a lopsided weight to her bags when she had it (she's the primary user of the battery). The flat, long shape makes it much easier to carry around.
Overall I'd give it a 8.5/10, as it doesn't seem to play nice with ALL chargers. I use a 5V1A charger and leave it plugged in as soon as I'm home until morning when it's got 1 light left. I've tried a few 5V 2A chargers and it flashes oddly enough to make me feel uneasy charging it via those more powerful chargers. Unit lasts me several days before a new charge, usually depends if my gf or I go Pokemon hunting or something similar that is more demanding on our phones.
Also note: the 1A port can be used with USB peripherals like lights and fans, making it extra useful with low-power legacy technology.