Go into the Apple Store and look at the new MB Airs (11 and 13) with the MagSafe 2 plugged in. Those that have been plugged in all the time (which is pretty much all of them) have burn marks on the top of the MagSafe tip. Is this what happens with the new MagSafe when you leave it plugged in? It's like the voltage is heating up too much and making marks on the silver. I've seen this at multiple stores on virtually all machines. Is this an issue for anyone that's actually bought one?