Yeah its the Army, we run an Adventure Training Ex out of the Blue Mtns 2 times a year (the last one just finished) and it culminates in a 100m rap off Dogface with 2 - 3 ropes plus rescue/backup. Previously for the anchors we had to run 50m ropes back to the trees at the top near cliff drive and sling the boulders just back from the edge.
I didnt install the anchors and havent seen them yet.
Dan
**Edit - List the 'cons' Neil and I'll email them to whoever installed the anchors.