I am in a quilt group and we have ladies from all over us and Australia. We have never had any problems,. Packages always get there,,,Just make sure even ifthey are friends that are trust worthy,,,Ive heard horror stories. The way i look at it when sending my round robins is would I be devestated if something happened to it?...If so I dont send it...I always send nice fabric but not my very favorite. You also have to be very accepting, Sometimes what you picture and someone else pictures can be very different, I have no problem with this but some people are not good at this.
Just a thought...I love the round Robins that I do that are international. Good Luck