As for use..
MI5 State Wide 2 - Chit Chat all over the state
On the West Side - Mostly in Kent County. We use Event 3 for ChitChat.
On the West side a majority of the repeaters are also owned by KCEST which is the non profit group that supports the Kent County SAR team. So the repeaters are used by and a majority of the users are on the SAR / RACES / Skywarn groups.
Hope that helps