I live nearby so I stop in every so often, usually just to browse. Sometimes I find a neat plushie or figure. They have a huge collection of comics, a really neat collection of high class figures and figureheads, along with plenty of t shirts and posters.
The place gets really crowded for free comic book days, but it's pretty fun to attend. A lot of people dress up and raffles are held.
Also the place is a pokestop, with another pokestop right next door. :D