I noticed the first time I plugged a Thunderbolt plug into my MBP Retina that the fitting feels a bit loose. I've plugged in both the Apple Thunderbolt–Ethernet adaptor and the mini-display port for my monitor, and both waggle from side to side by a good few millimetres. But I think it's mainly the Thunderbolt–Ethernet adaptor. Could it just be that the plug on that thing is particularly long, so it makes it seem like it move more? Has anyone else noticed this?