No problems here (I have 2, one of them I've had for 2 weeks) as the above mentioned, but I do have had dry hits because I thought there still was enough juice in the tank where there apparently wasn't. The funky light can make it look like there still is for 5-8 puffs, but no.
I used the .6 coil (and 3mg juice) with my first AIO because it came with that, and today, as my new AIO arrived, I also got 1.0 coils from Fasttech. So I tried to put one of those in the new AIO with a 16mg juice and phew, I almost get dizzy because of the nicotine! The vapour is still great, still makes fine clouds, not much (of any) difference between the two setups.
What I have observed, however, is that my first AIO with the .6 coils tends to get pretty warm when I chain vape. The new one with the 1.0 coils doesn't (yet?).