IF you lead a group, don't forget they will always try to stay at the same position.
And if you turn, this gonna make a big problems for them, as they will try to keep the same formation.
So it is your job to manage that if you lead the formation, and to use a good path to avoid collision.
But if you use this for AI only (without leading the group yourself), it works more than 90% of time.
I use it on all my missions, so I know it works, I saw many times the collision avoidance and pathfinding effects on AI course.
want some examples ?
=> edit missions inside this folder
http://okof4.free.fr/missions/DW/