The lowers are triangulated. This lowers the roll center of the vehicle considerable, and makes it closer to the front roll center. It creates a more balanced feel, but also makes the vehicle feel more top heavy at the same time. It also has good roll understeer characteristics, and it easily tunable.
Look here.
http://www.streetsource.com/forum/topic.aspx?method=reply&topic_id=94865&forum_id=93&forum_title=&M=False&S=True
Thats the last thread on it.