I just had a scare - I had my TBMBP plugged in as I watched a movie on my bed and as I got up to close a window I marched straight through the power chord! Once I recovered from my heart flatlining and a little rocking back and forth as I checked my precious for damage, I realised that the cable had slid out without issue, thus saving my laptop a la Magsafe of yesteryear. I have commented elsewhere that the ports loosen up and it appears that they do sufficiently to allow the cable to detach if you trip over it. I am certainly grateful as I have hardwood floors and so had the cable stayed attached, things could have been very ugly indeed. Hopefully I never inadvertently prove this theory again.