I've always disliked this kind of connection. I don't know why it's so difficult to use, but I can never get the darn thing in quickly and if you're fiddling around at the back of a desktop and not able to really see, it's almost impossible.
I guess it's because it's round and you have to line the pins up just right.
I prefer to just use Bluetooth keyboards and mice now, rather than fiddling around with a connector. They work just as well, are much more versatile and most of the time they'll sync up instantly without any need for annoying cables.