Okay, got my auto box mod last Friday iirc. Been using it every day for a week.
The pros: The switch is very durable. I had a leaky EDM carto ( the leak was between the outer wall and the underside of the unit) and sat the box mod with the carto pointing up. When I realized what was happening, juice was pouring down the side of the box. I took off the carto and literally dripped juice out of the switch. It wouldn't work at all. So I wiped the switch down and tried to extract as much juice as I could from the switch. Let it set overnight. Got up the next morning, popped in a fresh battery and it works good as new! The draw, which was normally a medium draw, was STILL a medium draw. So the switch is at least so far, more durable than most other auto switches I've used.
So how does the switch work? It's VERY similar to smoking a pipe. You need to take a few primer puffs first when your atty is cold. Less primer puffs when it's warm. I smoked analog pipes, so this is a very familiar, satisfying vaping experience for me. It might take some getting used to if you're a cigarette smoker though.
The device is very light. I found myself walking around with it in my teeth again, like a pipe.
My only con is the battery. The 14500's I got seem to only last me about an hour of chain vaping even though they're rated at 900 mah. Don't know if I did something when I charged them or if I just got a bad batch, but they should last me nearly all day, however they are not.
All in all, despite the battery issues I've had, I really like this little mod (it is very small btw) and recommend it to anyone who is a fan of auto batteries.