More than 1 contact point. Early electros wern't nearly as fast as the modern ones, so in order to keep them fair, they banned triggers from tournaments that had more than 1 contact point.
To all my knowledge, they're still not legal in any tournament rules.
Well as long as i can still play at local fields with my Vs3 ill be fine.. ill just buy a spyder electra or a Vs2 for tourney play then... or do you think it would be worth getting a new trigger system for my Vs3?