Priority tags are definitely NOT the official benefit. Having said that, it's mostly up to the mood of the check-in agent. Using the J-counters would increase the chance, but you shouldn't expect it.
On the other hand, J-counters ARE the benefit of OW Ruby. If you are turned away from J-queue, perhaps show a print-out of OW benefit table.
[This message has been edited by fakecd (edited 08-20-2003).]