High-quality assembly and useless software. Logitech makes good products, but produces a lot of unnecessary software that does not always work correctly. Pros below: Connects quickly to devices. Holds batteries for a long time. Pretty hefty. Quiet (but there are also quieter). Has some cons: There is a setting of F buttons as multimedia keys. It works by default and if you need a row of F buttons, then you need to activate the flag in the software, but when you turn it off / on it is reset (in the keyboard), but when you start the software, the settings of this function are not sucked in. I can not attribute this to a significant minus, the lack of backlighting of the keys.