I used it this morning, MEL-SYD, and whilst it is a terrible nice time saver (rolled up at the gate 20 min before departure, no need for 30 min requirement), there is SFA in the way of ID check. Held up the boarding pass that I printed to be scanned, the same as all the other pax, not a word, no indication of a check.
On line DG statement makes no difference to what happens at check in, and carry on baggage is subject to the same cursory inspection regardless of how you check in.
Nice idea, but full of holes in this post 11th Sept world that we live in.
Oh yes, I forgot: it will allow Dickie B. to cut a few more jobs, and make some more profit. That makes it all OK