BMV is absolutely a gem. I've been to all 3 of their locations, but I go to this one most often because it's close to where I live.
The selection is fantastic, and they have both used books and remaindered books that are brand new but at a significant discount below the cover price (plus DVDs and more). You can often buy brand new books that were published only a year or two ago at 50-75% less than the original price! I could easily spend a couple of hours browsing the shelves.
The staff are not at all in-your-face (they usually hang out behind the counter), but they're very helpful if you have a question.