Yours truly, in my review of the 2010 MacBook Air:
The computer is so light that when sitting on the couch cushion and charging I am not at all confident that the MagSafe would release before the computer would get yanked to the floor. I thankfully have yet to test this in the “real world” but in giving it a few tugs it seems to be that 60% of the time the MagSafe pops loose. It really depends on the material the Air is sitting on as the lack of weight in the machine means that it needs some friction to help that MagSafe release without pulling the Air to the ground.
Puts things in perspective a bit.
(Apologies for the missing images, I’ll have to search for those.)