I would agree with matt and say out (since I already took the pins out this year) and I just wanted to comment on the getting pushed off the top statement that if you are getting pushed off the top with out the pins your wheels will turn but won;t you be pushing back anyway?.....and also if someone has the power to push you off the top would you rather roll back or just sit there getting pushed on ........remeber it is usally the case that the less time that your robot has in contact with another robot the less chance something will break.
I also think that if someone can't stop their robot from rolling down the hill to hit one of therir stacks then they have more problems then the pins
