Just got my SS Zmax V2 from Madvapes in the mail today!
Although most of the reviews I've seen on it say the 8th menu defaullts to NEA (mean), when I first stuck in the battery, it was set to ANS (RMS). Also was in the power out mode (Po - 7th menu). Iv'e been trying various cartomizers and Genesi on it since I got it.
The Genesis models definitely need higher power. I set the power to about 7.5 or 8.0 for them. Already popped a coil on one of them fiddling about. The cartomizers have been good for me anywhere from 5.0 - 6.0 Watts.
Tried voltage mode just for kicks - nothing special about it; it performs as other VV devices perform.
I also did the spring mod - cut about a half of a coil off and straightened it a bit. Put the cut end into the end cap. May need a bit more off, but baby steps here - can't put any back if you take too much off the first time!
The slits cut into the tube didn't seem sharp to me, as reported by others. Maybe its because I work in industry and have tough hands, or they are finishing them better. Don't know if they are for function or looks - after all, it has 5 holes in the bottom. I think if a battery every did blow, I would want it to vent out the bottom, not the sides, where I would get a faceful of noxious fumes (Oh, well, it does look different with the orange showing through).
Lastly, I used some Noalox on the threads - the end cap was fairly smooth spinning, but now its like butter.