As plug and play devices go, this has been the easiest and quickest I have come across to install. It was simply a case of plugging it in and waiting a few seconds for Windows 8.1 to locate and install the drivers.
Quality-wise, the device is good looking, with a glossy finish to the main hub area with a number of LED indicator lights hidden beneath the black tinted plastic.
As for the speed, it's rated as 10/100/1000 gigabit, and it certainly connects to my Dell XPS 15 as and displays 1Gps, although I haven't as yet tested it for actual performance
I have experienced one issue, not with the device itself (hence it still receives 5-stars) but with Windows 8/8.1 and presumably windows 7 and maybe even earlier versions. When I used a laptop power profile other than High Performance the device would automatically turn itself off through Windows' built in USB power saving features. For some reason Windows assumes the device isn't being used after a few minutes and simply turns it off to save power, despite it flashing away transferring network data.
This can be easily fixed with a little know-how through the Windows Device Manager, find the ASIX (chipset used) network adapter properties, goto the power management tab and uncheck the "Allow computer to turn off this device...." option, apply and continue.
Overall, you can't go wrong with this device