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No, the iStick Pico is a temperature controlled mod which is fully protected - it's about as far away from unregulated as you can get whilst still producing vapour. It even has a display screen.

I don't think that the Colibri is a good example - it isn't any smaller than similar mechanical 18350 mods, and again there is the conflation of MOSFET (a transistor, in this case used as a switch) and a protection circuit. The circuit in the Colibri is used for overdischarge protection and...

The idea behind using a MOSFET is that the the actual physical switch you press doesn't need to take the full current - so the switches themselves can be more delicately built (i.e. cheaper) and don't suffer from the arcing and crud buildup that require regular maintenance on full mechanical...

I'm vaping an original Cheetah as I type, which I bought specifically because it was top airflow. Without that feature, the sequels are somewhat uninteresting by contrast.

Got to disagree about the Goliath. There are reigstering pins that prevent you from fully closing the top down, unless it's correctly rotated. Provided you tighten the screws correctly, and put the top down properly, you won't get a short. As to the airflow, as long as you build 8 coils for it...