They allow pre-orders, enough said.
It has been extremely tough to buy PC components recently—especially graphics cards and SFX power supplies. Thanks to BLT, I was able to get both without a hassle. They let you pre-order items that are otherwise impossible to obtain, and that's what really separates them from competitors. They also have very fast shipping and excellent customer service. BLT quickly became one of my favorite places to shop for PC components.