I've been using a Melo with stock coils for a few weeks now, yes i know it's sub ohm but its very reliable and has not leaked or gurgled or tasted burnt ever. The coils last a week to 10 days i change them when the draw seems a bit "wet". It's shortened the battery life of the istick 30w tho, to about 8 hours but I just top it up on the computer at work.