Someone else I think mentioned it earlier.While this should not be considered a fault with the new system, the response of one group in particular is a problem.
While the wheelchair folks are lined up long before the announcement, the family with kids under 2 are never on the ball. They get called and then they start packing the diapers into the bag, rounding the kids up etc. When they move they are the slowest in the world. Then once they eventually get down the chute, they block the door by working to get the carriages folded, more packing and repacking and then boarding completely oblivious where their seats are. This group holds up everything.