I just got mine today, but after trying to do dual-coils in it ( mega-fail, too little airflow ) I gave up and just did a single microcoil, and couldn't be happier with how it turned out.
Wrapped a 9/8 MachTechVpr-style microcoil around a 2mm mandrel with 26ga Kanthal, comes out to about 0.9 ohms. I left the legs long and mounted it horizontally ( through the holes, not around the posts ) with a good chunk of space between the air-shaft and coil.
This setup puts out more vapor at 13 watts than a 0.8 ohm dual coil setup on my Fogger v4.1 did at 20 -- probably because it's the best coil I've ever made, heats up super-fast and evenly. If I tried a similar configuration in the Fogger I'd be vaping super-dry cotton taste.
Kayfun v3.1 >>>>> Fogger v4.1 IMO