The OP asked about the C79A2-1 and who has used it. There is only a very few that would have had their hands on them so far and me, 90irocjustin, and imsharkbait are some of them.
To add to the confusion a little the designations are actually:
C79A2-1 (which actually have an "A3" labelled on the scope by the manufacturer but that is not a DND designation) they have the honeycomb anti-reflective filter on the front and the reversed spring mount.
The C79A2-1 with modification is the scope with the washer inserted to adress the wandering zero issue.
These scopes are brand new and most Reg units will not have these issued yet or have the C79A2-1 without the washer mod done yet.
Two things about durability, I fired mine all summer at Bisley, two training camps, NSCC, and CFSAC and I had no issues (which included hauling it through the two obstacle courses at CFSAC) and never once had to re-zero. Time will tell how they hold up to general use but to be fair they have not yet seen widespread issue.
Second thing is for those familiar with the method known as "open gate shooting" with the C79, this puts stress on the mount and elevation drum that the scope was not designed to withstand. I am not surprised that a rifle team shooting hard all summer and fall as the guys mentioned above will see a few wandering zeros over several months use. This is not typical of the general use of the scope.
All that said, I'm not a fan of the mount design either but I like the optical quality.