I have the Vamo and got my China GG on Friday. Because the Vamo cuts out on resistances less than 1.2 ohms, I would have to do 6 wraps with 30g Kanthal to get it to 1.5 ohms to insure it would fire. Any less wraps and my genesis clones would sometimes not fire due to low ohms. With this number of wraps, it takes a while for the coils to heat up, likely because it has to heat up a larger surface area of the wick. 4 wraps of 30g gives me about 1.0 ohms and there isn't any delay in the coil getting hot on the China GG. I feel like I get a fuller, more responsive vape with the China GG and a low ohm coil. I will caveat all this with I have only been using gennies for a couple of months, but they have replaced all my other atomizers: dripping RBA's and tanks. This is my first mechanical mod, so I'm probably not adding anything new to the body of vaping knowledge, but just what I've found.
That said, I've been rotating between the Vamo and the China GG.