I have just set mine up.........
My learning curve consisted of a bunch of e2 errors because of the low resistance cartomizers i selected. My Big Daddy and Little Mamma tanks were soooo tight i had to disassemble them and lubricate the cartimizer hole with Burts Bees..no mess no fuss just a dab on a q-tip and problem solved.
Pre-punched cartomizers I ordered were extremely small micro punch....only one and needed to be enlarged.....the juice did not flow into the cartomizer.
I ordered 6 different tanks from 4 different vendors....all work .....none leak.....but the more substantial ones were also a more substantial price.........It's a ProVari IMHO.....now is not the time to pinch the pennys
Some things to consider;
Make sure your using 3ohm maybe 2ohm cartomizers.
Get a cartomizer punch or if your a manly man punch them yourself.
Good luck