I have participated in a few, both went well, were well organized and the people seemed to know what they were doing. I do have one complaint and that was the religious overtone of one of the rides that involved holding hands, prayer and singing; just wasn't my cup of tea. I don't own any PGR stickers, clothing etc; I did happen to know both of the people we were escorting and the family requested the PGR riders. I would/will do it again I think it's for a good cause and it appears that the families often request their presence.
In one year I rode 18,589 miles on an island that's 72 miles long. That's 50 miles a day everyday for 365 days. I think I'll go home now. 69k miles and still riding http://travelwithe.com/blogengine.net/