I used to use a Protank mini, and didn't like the new dual coils at all. Too slow to heat up, and just not warm enough, for the same number of watts.
I like the "mini" RDAs, I use a Smok Dripper RDA. I'm going to order an A6 and/or Igo-S so I can use my own drip tip. They both have a rim around the edge so stray liquid doesn't fall out if you pop the cap off the way the Smok does. I don't see the point in the larger RDAs, seems like a bigger chamber would just mix more air in with the vapour. Coil placement is critical. Giving it a bit longer legs and pulling it closer to the air hole made all the difference, and you can fine-tune it by adjusting the height.
I use mine on a standard EVOD battery, 3.7 volts. 30 gauge 1.3mm cotton microcoil. I drilled the airhole out to 1.5mm. With 1.4-1.5 ohms it's 9 or 10 watts, and the performance is such that I don't feel I need anything more than that. I also like the fact that it looks like I'm sucking on a magic marker rather than a dildo.
