Every tank mentioned here give access to the heads when the tank is full. The Delta II is a solid 1st gen sub ohm tank. I just dislike it's size and how hard it is to see your juice level without good lighting. Airflow on par with the Atlantis, flavor in par with the Subtank. Interested to see where Joyetech takes the next iteration. The Subtank Mini and Plus have the RBA section included. Joye really should have included it with the Delta.