Been using this system for about 8 months now. I've found it has it's pros and cons. From my experience, can share I can share a few comments:
Using the right liquid, it hits hard (I use SaltBAE Red Mango - 50mg). Maybe too hard for some, but it's what I like. The battery and pods are fairly inexpensive, but that's a good thing, because I've found that about 20% of the pods you buy are duds right out of the box. Some will work for a few hours, then quit. Others may last a day, and I've had others last up to a month with no problem and heavy usage.
When first starting a new pod, they taste pretty bad. I've found it takes an hour of use to get that "new" taste out of the coil (whatever it is). After that, your good to go. I've heard of people talking about leaks but honestly, i've never had ONE. Is one of the main reasons I still use this system. You can turn them upside down, leave em in a hot car, or whatever. Sometimes you may get a small amount of condensation around the inside of the pod, but it cleans up easily, and doesn't seem to affect the coil.
For the coils that quit working (they just refuse to activate a draw-no battery light comes on), I've found that some of them will come back by pulling the pod out, and tapping that bottom a few times on a hard surface. I havn't tried the twisting, but will on my next dud. I've had to replace 3 battery mods that just quit working, but to be fair, I dropped one in coffee that continued to work for about a week. Once the coils start giving out, they will begin to taste horrible, and replacement is necessary. Again, I find this fairly cheap (especially compared with smoking), and I have been ignoring the high failure rate for now. I keep 2 of these on me at all times, because the battery life could be better. It's not horrible, but 1 will definitely not last you through the day, and if your going out, it's better to have a spare. I really like the draw on these things. It's perfect for me, so reluctant to try another. Anyone out there use these and found a similar setup that works better?