I've shopped here many, many times. Huge selection of books, CD's, DVD's, magazines, and more. The clearance section is quite large as well. I pick up paperback books here for $1 when I'm heading out on vacation. When I'm finished with it, I leave it behind or sell it back to another used book store at the location I'm visiting.
I've shopped at different locations around the city and each has a different feel, along with different books, etc. If you don't find a book you're looking for at one location, they might have it at another!