I heavily used my mini nautilus from about November 2014 up until last March, and still use it lightly. It became my "stick in breast pocket" to go out for dinner setup with an istick 20W, or my "I need to go visit someone for an hour" setup, while I used my IPV Mini 2 more at home or long visits at my parents. I used to really enjoy the istick/mini nautilus setup, with only more gripes about inconsistent coils and some gurgling, but I have noticed in the last month or so, I'll fill it up with Boba's Bounty (expensive in Canada, up to $14 cnd for a 15 ml!) and even with a new coil, in 2 days of little use the juice would darken (oxidization) and almost become unvape-able (harsh throat hit, harsh taste,etc).... Expensive juice is just too expensive to have a tank darkened like that. I used to sometimes vape the darkened juice down, dump it out, and fill it up, and it would just darken again quite quickly. It sucks.