If you love books, particularly hard-to-find, obscure books, this is your store. I personally don't have the time to get into zines and underground writers. They carry some interesting items that would make good gifts, though. In my experience, the staff isn't very friendly or helpful, and the used books are VERY overpriced.
I would really only recommend this bookstore if you have a significant amount of disposable income, or you are very into the underground writing scene.