I just rode this in May as part of an organized tour put on by Road Scholar, the "seniors" travel organization. It was catered by the guys from the Defiance bike shop that's been commented on. We met in St. Charles, were transported to Sedalia, and rode back over the course of 5 days, staying in hotels and B&Bs. We had about 40 riders in the group, but it all went off amazingly well. The spring weather this year was pretty awful, but we happened to hit the one good week between storm systems. We never got rained on and the worst weather was one day when it hit 90.

I would definitely do it again, and with this same outfit. My photos of the trip are here, but they're probably not of much interest if you weren't part of the trip.