Well I do like the KS, so I had to try it. Got it from Kanvape, they have it in black, and Silver. $20 to my door. Its pretty much the KS with a dual coil deck, a little more capacity, and a fair bit more air flow.
Not much excitment with the RBA deck, pretty familiar design, but it works well enough. Also uses Supertank pre0builts, which I believe are compatible with Atlantis type coils. I have a 26g 316L 2.5mm dual coil build in it coming in @ .23 ohms. Usable power or TC mode. Currently using it in TC mode, resistance is stable its working quite well.
Air flow not as open as some of the latest, but quite sufficient for good open lung hits. It does not close off 100%, but does shut down pretty tight.
Tanks are not interchangeable between the KS, and the KS ST. Overall I like it, I have not tried it yet with prebuilts, but it does include one .2 ohm, and one .5 ohm coil heads.
Kind of cool in the respect it is an original design by Tobeco, it is most certainly based upon the Holyland KS, but internally it is quite different, and to me improved a fair bit, especially the AFC.