For along time I liked my Orchid on it, in short tank mode. Right now it has a Plum Veil on it and the flavor is very nice. Iv got a Cyclone mini coming in that I expect to look and run good on it, as well I have a Origen clone coming in that I also expect to do fine on it. I do have a few fixed pin non adjustable RDA`s that can not be used on it due to potential shorting issues.
Its not rocket science, I can drive any car into a wall, any car, if I don`t know what I`m doing. Its as SMPL as understanding the difference between a closed and open circuit, and how to prevent one or the other.
Edited to add: The KF may not be the best choice, the ones Iv seen do not have an adjustable center pin and the center pins are also placed up into the 510 connection, so understand that you do have to keep a good amount of space between the two 510 connection points so as not to cause a short.