I can drag my 3.5 lb. 13" rMBP across my glass desk by the MagSafe adapter's cord, even with the rubber feet on the glass providing resistance. The MagSafe magnet is pretty strong. It would be much easier to do with the 2 lb. MacBook.I disagree the new laptop is too light. It does not take much at all to disconnect the MagSafe. Even at two pounds you have to realize it is flat on a surface. The laptop isn't standing up vertically, so the weight is distributed.