I wanted to get into RBA's with tanks after purchasing my first RDA the IGO-W. I was blown away by the vapor I was able to achieve, but hated dry-hits every 10 or so. Being serious about getting legit equipment, I didn't want to do clones. After great recommendations from Thrasher, I opted for the Aqua for it's dual coil build and a Kayfun Lite for it's massive tank and general popularity of the Kayfun models. I've been vaping on both constantly for a couple weeks now and really loving both, Here's my breakdown of the pros & cons. Aqua: Dual coil building is great. Threads are awesome. Airflow is sick. Design & Threads are perfect. Dig the hand-tightening screws for builing CONS: Leaks:Took a while to get filling down and once I switched to cotton rather than ecowool it hasn't been an issue. Tank size is a bit small. overall a little messier when rebuilding/assembling. Kayfun Lite Plus: Build is top notch. Tank is massive. Clear chamber to see how much liquid is handy. Aiflow screw is handy. CONS: Filling with the screw in the bottom is a bit of a pain on the go, but I fill from the top if I'm needing to without trouble. Wish I could dual coil build on it. Love my ohms to be right around .8 Vaping this on my Provari 2 at 1.6 ohms at 4.3 volts right now but suprisingly it produces almost as much vapor as the Aqua at .83 on my Smoktech magneto. Flavor is almost identical, but I would give a small edge to the Aqua. Very pleased with both. I had originally planned to see which I liked best and then sell the other, but even though I'm in the hole almost $300 for the two of these combined, It's VERY worth it for the best vaping experience you could ask for.