I bought this to pair with my Logitech K380 keyboard to the computers in the computer lab at school and it works perfectly. The computers run Windows 10, which allows for plug and play bluetooth without the need to install drivers. I plugged the dongle into the computer and went to settings and paired my keyboard just like if the computer had its own bluetooth.
If you don't have a Windows 10 computer, you might need to install drivers, but this dongle comes with an 80mm disc with drivers in case you need them. The dongle is also small, but not too small. Logitech's unifying receivers are really small and difficult to remove from a computer. In my case, where I plug the dongle into a public computer, I need to be able to unplug it without issue. This dongle is large enough to allow me to unplug it easily.
If I had to choose anything negative about this, it's that the blue status light gets annoying quick. It blinks to let you know it's broadcasting bluetooth, meaning there's no doubt whether or not it's working, but it never stops blinking, which I imagine can get annoying quick when it's on a laptop in a dark room. Other than that, this dongle is great. I haven't noticed any drop in connection compared to a 2.4 Ghz wireless connection, which can get interference from other wireless connections. That being said, I don't think anyone else in the lab is using a bluetooth computer, so I am in an optimal environment.