I should have read the question a bit better. While the mini sits flush, the regular subtank probably doesn't over-hang enough to bother most people. I have a subtank mini on my IPV mini, love it. If I was deciding which one to get, the Subtank mini all the way. If for nothing else than the ability to change from stock OCC coil to RBA mode WITHOUT having to change the tank innards. Changing between the two is a simple matter of unscrewing one and screwing on the other - no emptying and top cap replacement. Oh, and the airflow is better on the mini since the chimney is just a bit wider.