Bic Camera stores are quite cramped and can scare away the claustrophobics, at least when compared to Yodobashi and Labi/Yamada stores. Nevertheless, I have noticed that various video games I priced at the Bic Camera in Shibuya were 10% less than the prices of these competitors. So perhaps smaller floorspace results if bigger savings for the video game customer.
The Shibuya store is in a very congested area and so it is easy to find, but also easy to pass-by if you are not paying attention. If you are only planning to visit on of their stores go for the Ikebukuro one, or Tokyo station one.