Henry Cohen 3 At least I think its a problem that the LED indicating that the dongle is connected is on what faces the backside of the matching connector. So if you are plugging in a Yubikey (as I am) you need the key's touch sensor to be on the opposite side from the LED. I think this is the main reason that Apple invented the Lightning connector, they didn't like the polarized nature of all other USB connectors. Now USB has type C so they too are moving away from polarized connectors.