While I have not actually gone on one of their tours, Backroads seems to be a first class operation. On several tours both in the U.S. and Canada we have interacted with their groups.

We have camped in close proximity to them, borrowed their tools, eaten with them, and asked them to return a key to a motel located in the town they were heading for; all great experiences

https://www.backroads.com/bike-tours

They also set up the Tour De Vita starting in a community near us. Five hundred participants! Look at 2014 photos.

https://www.tourdavita.org/