Hey, made the jump to RDA's a month ago, loving the flavor and the easy draw on them. I really am missing having a tank while driving. I have a Delta II and Kanger Subtank Mini and the airflow on them is just too restricted. The Delta 2 actually provides better airflow but it's barely acceptable compared to my Mutation x4 (I run bottom holes open only). I'm just looking for an RTA with RDA-like airflow. I've heard the Lemo 2, Billow, Goliath, Monster v2, names being tossed around, but I need someone who has firsthand experience with these, or at least the tanks I have to compare. Tank capacity isn't a big deal, it only needs to last me a 30-45 minute drive (couple ml's). Thanks. Would even be willing to work with some hybrid RDA's if you could help me out.