19mm Ijust Start+: I like these. I bought one to switch from smoking. This was about 18 months ago. Bought a second to go with it a couple of months later. The first one has only just died (screw has gone in the top). I have used this device heavily for a year and a half, until now,it's survived drops, flying around the car, being dumped in a pocket with keys etc. I don't think that's bad. 0.75 coils give a good, if slightly 'tight' direct inhale vape. I tend to find the coils last longer with certain liquids but that's not unusual. As of writing these are outdated now, but I am still happy using the one I've still got. No complaints.