71's arm was the best that I saw at Nationals. Period. It was fast and simple. If you had an arm on your bot it was very tough not to have a high center of gravity. In case you strategists haven't figured out by now, a great strategy to stop arm bots is to either 1) put something in the way of the arm such as a robot or 2) go back into them under the bar and push them, if that's possible. #2 may not work on some robots due to the fact that they can't be pushed around easily.
In my opinion, we sorta over-engineered our arm. It was too heavy and too large for the job we wanted it to do. Cudos to 71
