It works fine, charges small devices/tools smoothly. However, the advertised 3.1A does not reach even close. I can barely get 1A in each port and even that drops to 0.5-0.6A after a while. It is not suitable for power-hungry devices. I use it as a charger for small tools and gadgets and it works well, but it cannot power a large tablet or fast charge a modern phone by any means.