[Billius]

I only used the E-Stop in a practice round. Our auton program went crazy and attacked the spectators (seriously, it LEFT THE PLAYING FIELD, would have been cooler if it went after the judges, lol j/k). However, since our robot coasts very wheel, it was a good couple more seconds before it actually stopped.

Anyway, back to the point of this thread, make sure that you twist the E-Stop button all the way in and then make sure that you release it by twisting it the other direction (there are arrows on the button). If you don't release the button, you can be disabled for the whole match.