Lunchbox isn't my favorite, but it isn't a bad place to be either. My only complaints are that even with less than 6-8 people in the shop, it gets rather crowded and uneasy to maneuver through the shelves. In addition to this, the staff isn't the friendliest. If you ask, they know what they have available pretty well, but from my experience they just weren't all that welcoming.
Lastly, come expecting to spend some cash. While you may find something really surprising (like the soundtrack to "Lost in Translation") don't be prepared to find it for a deal. But hey, they gotta keep the place open somehow, right?
Aside from these things there is a good selection of demos and such from local bands which I haven't been able to find anywhere else, and new releases can be found in-store too.