My subtank Nano is 6 weeks old now, still not one single leak, dropped it, carry it around when I'm cycling... and cleaned it several times and have only had two semi, mildly dry hits and that was trying to chain vape with SB Derailed which is around 80-90VG.... Take a draw without pressign the fire button through max airhole and that seems to take the dry hit taste out of the coil, tank and juice and then next hit is great.
A coil seems to last around 2-3 weeks, .5ohm at 30 watts....
I like it so much I'll probably buy another to have 2nd flavour option in as one flavour a day can get boring and cleaning that often is annoying.