I have the lip and it is too damn low honestly. If you are not daily driving, then it shouldn't be an issue. I am dropped on H & R Sport Plus springs, which are a tad lower than the OEM ZCP configuration. The tip of the lip is literally 2 inches from the ground. Here in FL, the roads are pretty straight, however, areas with hills are very cautious areas to drive through.
Previous: '04 BMW E46 ///M3
Current: '08 BMW E92 ///M3, Space Grey, 6MT