Shane sorry you are not able to join us in this round. But there will always be others. Just you try and stay away :-)
Ash, I think at we are the only group exchange. The post card exchange everyone sends a post card to several others, the Blind Print exchange is similar in that you send to several other participants, and the lith exchange is the same. One that is close to ours, but only in print size, is the small print exchange but it too sees each participant sending prints to a few others.
Ours, while it relies on one individual to sort and send all prints, represents the best value for money for any one anywhere in the world in terms of number of prints for total postage spent.
I enjoy it, and am very content with the small part I play.