I did see that chris I was just wondering between the two as the 868 has greater distance and since I live in europe I am able to use them both. I will probably stick with the tried and tested one at the moment as the 868 seems to have some minor issues.
There is a discussion started by Reto on the 868 and it's limitations. I personally would like to try the pro XSC but haven't found any reviews about it yet.
Replies
http://diydrones.com/forum/topics/xbee-pro-long-range-made
you'll see that there are some communications issues which are not resolved as pertaining to continuous data "streaming".