Precautions on the MagSafe2 adapter: Laptop can drag to floor.
I have several Mac laptops using the original MagSafe adapter. On rare occasion someone has tripped on the power transformer or wire and the MagSafe came out of the computer and nothing was harmed. That's because of the higher profile and the straight exit of the cord.
The new MagSafe2 right angle and lower profile configuration can be problematic. Because the original MagSafe projected away from the computer, pulling at most angles caused the LED head to be pulled from the computer. BUT the right angle and smaller profile of the MagSafe2 has posed a problem. Twice this year pulling on the cord has dragged the laptop off the table crashing to the floor.
To remedy this, have used Glue to loop the wire back to the charging piece so that in effect it becomes like the original MagSafe. This way pulling in most directions allows release of the charging piece from the laptop, whereas otherwise the computer whould have been dragged across the table and possibly to the floor. An alternative would be to decrease the magnetic attraction so that a gentle unexpected tug on the MagSafe2 disengages the head from the laptop.
Wikipedia: http://en.wikipedia.org/wiki/MagSafe
MagSafe vs. MagSafe2-OTHER