Thought I'd update my findings so far, since I got my Provari on Friday afternoon. I'm currently running the 18650 battery in mine with the extension cap. I'm also using the MapTank with a 3.2ohm cartomizer installed. My juice is DIY 20mg 70PG/30VG%. I've been running at 4.5v pretty consistently. Maybe down a few times to 4.2 if it just seems like my nic level is getting too high. I'm probably going to drop my juice to 15mg soon, as this system is just sooooo consistent that I'm having to make myself slow down or stop vaping for a bit to let the nic levels lower in my system. That being said, I'm vaping about 6-8ml per day and my battery is lasting all day from around 4:30am till the next morning when it's still working and I just swap a fresh battery each day. I couldn't be happier! I know I'm not hitting high voltage by any means, but I get a nice deep billowing plume of vapor from this setup, with plenty of nicotine satisfaction(almost too much), no harsh, burning taste, raw throat, etc. I have two MapTanks atm and swap between them, cleaning them each time I refill. I've tried many mods over the last year and without a doubt this setup is the most consistent and closest to that genuine "take a drag" feeling of smoking that I've found yet. I'm ecstatically happy with my Provari and will in fact probably be selling off several of my other mods and buy a second Provari as a backup! Ohh..and it's definitely worth the wait!!