I used a tank for a few weeks. Coming from a joye 510 that I used for over a year (with a regular ol' 510 atty/cart), it was bliss! I will say, there is a learning curve. After about a week of trial and error, I figured out how to get consistent hits out of a tank system with no leaking. To get started, you'll just need a tank atty or two and some empty carts (assuming you have juice). LR attys hit harder, but their lifespan is less.
Some of my findings/tips/tricks:
Tank attys require frequent blowing out. Two carts full of liquid, then the atty would need to be blown out.
Dont fill carts up all the way, leave an air pocket.
Like any atty, let it cool down. Two hits back to back was ok, but no more.
I found that tanks are best for long, steady hits... about 5-7 seconds.
Tanks go through a lot of juice. A full cart (1ml) lasted me about an hour when vaping heavily. Medium vaping, about 2 hours.
A lot of juice gets wasted from having to blow excess juice out. Also, tanks can flood an atty quickly. Flooded atty=less flavor/vapor.
Tank carts will leak around the top cap (70/30 pg/vg juice). After using a tank once, I dried it out, sealed it up with RTV sealer applied with a toothpick, then let it dry for 24 hours. After sealing up the cap, it became necessary to fill carts with a needle. This was manageable, but sort of a pita. Also, I had to go to the pharmacy and buy a needle... haha.
SOME tanks will also leak around the spike. To prevent this, put the tank on the same way each time. Dont let your spike make a huge, gaping hole in your cart. Dont take your cart on/off too often. Lastly, use clear carts. This will allow you to 1) make sure your cart isnt leaking (see how fast its draining) and 2) see how much juice is left!
Why did I not last with the tank? Like I said, it was milllesss better than my 510 starter from over a year ago... but I tried dripping using a cisco lr 306... and I was sold. The tank would not longer satisfy me. But then again, I always vape 24mg and came from a pack (sometimes more) of strong menthols per day. Hope that helps!