The name is a bit misleading. Yes, they do sell computers and peripherals. However, NYU's…read morebookstore is also at this location. And even calling it a bookstore is misleading, because it also sells NYU shirts, sweatshirts, hoodies, and other NYU paraphernalia.
Regarding computers, I have noticed that the prices are competitive with other retailers, and when I once purchased RAM for a computer, it was actually cheaper. You will probably get better prices online, but if you need something computer-related immediately, you should check this place out.
Textbooks, however... Well, as my dad says, "that's how they get ya'!" They are way overpriced at any university. Unfortunately, the Barnes & Noble on 5th Avenue and 17th St., which used to have decent prices on textbooks, is no more. I loved going there as an undergrad and grad student and saving a few bucks. If you are a NYU student, you are probably stuck getting your textbooks here, unless you shop for them on Amazon or something. On the other hand, you can rent textbooks at this bookstore. I have never rented a textbook before, so I can't say anything about it.
There is a regular bookstore, and the prices there are decent. They also sell classics at a discount for $3-$6.
The clothing section is pretty good, and the prices aren't bad. Depending on what you get, items can vary from $15 (t-shirt) to $70 or so.
They used to have a cafe, but unfortunately they closed it down. However, it is a nice place to visit, especially if you want to pick up an NYU shirt.