2 experiences with this since it opened. first time it was amazing. Totally easy, no lines, so quick, a welcome relief! The second time, the 'premium' line was longer than the normal one and ridiculously slow. they were letting people up who weren't EXP or traveling in first/business b/c I saw the family in front of me that were just plat traveling in coach.
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so far a mixed bag but better than nothing. Guess you just gotta catch it at the right time