Pros
If you want good health benefits and a chummy work environment, Half Price Books is the place. It is hippy/hipster paradise where you get hands-on with old texts and rare/weird movies and memorabilia. If you find a location with good co-workers, you'll have a good time.
Cons
The company does not operate by its own rules. It promotes environmental awareness, but I worked at a location that literally threw thousands of brand new books away over the course of 3 days while moving store locations. There wasn't enough room to put the books in the new store, so instead of donating or recycling them, we threw them all in the garbage. The kicker? When students from the local university began pulling the books out of the dumpster (which only had books in it - we had gotten an extra dumpster just for all the books), our managers called the police on them. Then it started raining later that night. Thousands of brand new books were destroyed. Since the manager of that location now has a better position at a bigger location, I can only assume that this type of behavior is encouraged or rewarded by the company as a whole.