Another thing to consider: groups and communication. It worked well on the Washtenaw ride and last fall’s Color Tour. With small groups and the lead/trailing guys with radio communication, we were able to keep us all together and deal with falls/breakdowns, etc. The old school “watch for the guy behind you” also works well, but can be tricky if the group is large and we have lots of dust. For the record: I enjoyed being the “sweep” guy on those rides.
I think many/most of us have Sena units – so we should be able to pair up as needed. I added a column to the phone/bike list to track who has what.