I shop on Amazon quite often, however I received this one as a gift, so here is my review. The size and weight can easily fit into a purse or satchel without any issue. It is very solidly built and looks great.
As described, it has 2 usb ports for charging devices. 2.1 charges larger devices with large batteries require 2.1amps I use it to periodically charge my Samsung Galaxy S4 after hours of HEAVY use, and I also use it for my 2012 model Google/Asus Nexus 7. I can charge both many times before needing to charge my Konnet again.
PS, the included cable is ok, but I prefer using the cables that came with my phone and tablet for better fit.
There are 0 issues with this device and I am very happy with it.