If it is mild and goes everywhere, the downside is that it is only 3200 mah. Maybe, but me, it suits me perfectly for the use I made because it is a battery backup to restore quickly a boost to my mobile phone. Laptops are on average 2500 -3000 mah even today. So it is for a single refill or a bit more if you do not start from scratch. Charges in a few hours on a PC.
I love the power of its light beam. Frankly, now, when I look for something in my bag, I use the flashlight accessible by the button that activates the battery. It is powerful, easy and convenient.
Ultimately a great extra battery that will help you out on any occasion.