We have never had a problem at the events, however if you do bring a laptop I would recommend not leaving it in the pits unattended (general common sense stuff).
However, be careful where you take/leave it outside of the event. We had one of our team members parents that drove down left a laptop in the back of a minivan in a supposedly "secure" parking garage while in a restaurant and came back to find the vehicle broken into and the laptop gone.
