I only have a couple styles of RDAs - my favorite is the Velocity. It's got a huge build deck, and I have the bottom-feed pins for them. I'm hitting a standard one right now on my ipv Mini 2 with some DIY, and I haven't had to re-drip in at least 45 minutes. THAT I love. I like my Atomic - it's a little small for my fat fingers to build, but it's a decent rda. I grabbed some Mini RDAs from fasttech, and they're pretty much for "amusement" only.