I recenly discovered GCC and must say I am impressed by their large store and selection, yet if you talk to the employees here, you still get that sense of small comic book store feel. The organization and labeling of the comics is sound and makes it as easy as possible to find stuff. I'm mostly a Marvel comic guy and Robocop fanatic but I enjoy the occasional graphic novel as well. For the collectors, I've had them track down an older, out of print Amazing Spider-man so I'm glad to see they do that kind of thing.
If you're a comic person at all, you definitely have to check out GCC at least once, and I'm positive you'll fall in love with this place.