Good build quality and fine exterior, better than the corresponding Belkin. Feels that it is a quality product and it loads quickly.
The capacity of 4000mAh is a little bit in relation to its size, would have liked it stood at 5000mAh or 6000mAh such Deltaco counterparts do, although obviously I knew this when I bought the device.
At both in and out of the connection of the charging cable, a power cycle on powerpacken. That means if you have smth linked at the end, dropping the gadget excitement for a while that a reboot. If you drive a Raspberry Pi can not use F8M979 as a kind of UPS.