Checking-in at GRB this morning, I asked the UA agent if United Club members could access the SkyBox lounge. She was a little confused, but after a few moments was able to share a one-day access card. The lounge itself is much nicer than the outside terminal. The lounge has a television, nice desks and free non-alcoholic beverages. I would not pay for a membership if I did not live in GRB, but will definitely use it again when I next visit the airport.