i haven't got my new ones yet, but been vaping the originals since they came out, if its gurgling, its about to start leaking, usually out the vent holes or out the bottom. i just blow in instead of suck if i'm getting dry hits, mine are really bad at this point though because they are so old.
It's gurgled with no leaks. The gurgling sound seems to go hand-in-hand with good wicking. Might just be this model or just my unit, I dunno.
Cover vent holes + hard primer draws = gurgle, flavor & vapor.
So, this morning I woke up and still no juice dump from unit #2. Haven't refilled the first one yet, but I will soon. Been vaping the two Phoenixes I had filled. I'll get back to it shortly to see if a tank was enough to break it in or if this has nothing to do with breaking it in.