Anyone knows the in-airport benefits of Delta Reserve?

I was trying to get thru the breezeway in O'Hare. however the lady at the counter said he had never heard of Delta Reserve and that wasn't allowed boarding early.

I also have to clear that O'hare Delta check in kiosks did not print my boarding pass with my number and had to be keyed in manually. But then their ticketing printer crashed so they couldn't print a brand new one.

I'm thinking for paying 450 dollars, you should at least get priority boarding!!

Anyone had similar experience?