When using Allen Wrenches (Hex Keys), I've always held onto the long end because I figured it gave me better leverage and torque. Sometimes, in hard to reach places, I would hold the short end.
Then I saw these ball end hex keys. They claim that:
The advantage is that their ball end make it easier to slide the wrench into the receiving slot.
In my opinion, they've put the ball end on the wrong side.
Have I been using these incorrectly my whole life?