Pros: No tool access is neat, I am not sure it's a pro, I mean if you are building a system, you probably have more than one Phillips screwdrivers laying around. The ventilation is superior. Comes with a 120mm fan in the rear with mounts for the front and side. For a small tower, there is plenty of room and no sharp edges.

Cons: The drive cage doesn't come out makes locking down the other side of drives a bit of a PITA. Not a huge deal though.