Not sure about the Genitanks, I think they are chrome plated copper. Normally this would be a great long lasting combo, but I get a little nervous about plating in atomizers. It should be OK in a genuine Kanger though. The top cap design is not as manly as the Mega, that's a plus or a minus depending on your point of view
Another thing you should be aware of is that you are limited in drip tips on the SS Mega. Don't know about the Genitank or the Giant, but in the Mega the drip tip hole is not very deep. Most of my tips bottom out leaving a 1mm gap between the base of the tip and the top cap.
Chrome plated copper
Now that I look at the pics again, it does have that chromed look, no thanks
I want SS atomizers only .. Not a big deal about the drip tip situation on the Mega, the Giant fits whatever drip tip I put on it, but I have only tried two. I am ok with the standard one though.
But that sucks though about the button 
Why, I am not sure? The Kayfun Mini is a high demand item right now, so it would make sense to me to publish it now, but whatever *shrugs* I was initially thinking of the 14500 Nemmy for the KF mini, but I am actually leaning towards the Ego Mega 1200mah VV for it. But I also enjoy it on the DNA30 too.