Originally Posted by
N1120A
Its very worth it. Removes nearly all need to talk to CBP agents, except at the airports that seem to try and follow their own rules (ORD comes to mind).
That's not been my usual experience at ORD, which is my home airport. They did once have a table set up for CBP to check your GE receipt, but that was definitely the exception and not the rule. I guess it depends on timing and what other thing they have going on that day, but that could be said for ANY re-entry point.