Heard its been effective at the highschool level, but must admit I don't go to many HS games.
I go to a bunch of high school games in Iowa where the sit down rule is in place. It has certainly be a challenge for the boys' coaches. The rule was in place previously for the girl's coaches the previous few years. Saw our coach get T'ed up in an early game this year for violating the sit down rule. It does keep coaches down....most of the time.