I have some more questions. Going to be a hypocrite here and reconsider built in battery devices.. I'm in a bad situation where neither of my devices are working (Subox Mini threading expanded from heat or something and I cannot screw tanks on. Threading doesn't look stripped though)
1) Is the Ego One an unregulated device? I have been doing a lot of research on these and they seem really interesting. I like the size and shape of them a lot, but is this basically a mech? I am concerned about the safety compared to a VV / VW device. I am considering getting one and swapping the tank for a different 510
2) I am also considering one of the iSticks. Does anyone know what the smallest variation is that can do 1.0-0.5 ohm?
The Ego One Tank is crap in my opinion, the mod is not unregulated but you cant regulate anyhing

It has safety features built in. I bought one for a friend because I thought it would be a great beginners device but it was leaking and had issues with not firing and stuff like that. The friend went with a iStick50 and a subtank mini then and is happy. (But the iStick50 has issues too).
The iStick TC 60 is rather small and has temp control but not for stainless steel.
Id rather get the evic vtc mini or the cuboid.
If you are looking for a well made small and nice looking mod check out the vape-forward Lite!