wow ... it was really great reading all the posts since i last posted, so i thought i'd give my own update!
i had to actually toss an emdcc after only 1 day's use. it wasn't working great to begin with and then just quit (totally dead ... nada) right in the middle of taking a draw, so i wasn't messing around with it at all. also, when i pulled the filler, i didn't notice any burn on that one or the other 2 i pulled the filler on (saving for later use on something). i must not be dry burning them. lol so far, since early in july, i've given one away, opened 10, and 3 have died on me, so i have 7 left in rotation. sometimes late at night, i've just opened a new one because i didn't want to fool with anything and wanted to hear the snap, crackle, and pop (if it's going to do that ... some don't). for some reason, i'm still able to use the 2nd one i opened. after all i've read, i am wondering about the echo, but i like a warm vapor, so i'm in no hurry. also, i have tried the emdcc on my passthru and it works great, but i'm not sure what the actual voltage is. i've read that not all ego passthru's are 5 volts because they are limited or something like that. anyway, mine sure doesn't vape like 5 volts.
concerning the filler tube closing up, i seem to have more of a problem with that when my juices are too thin. really thin juices seem to swell the filler more. anyway, i've found that i need to run the paperclip thru between fillings (any time the draw gets tight). if i let that go, it just almost completely closes. condensation on the battery seems to cause a tight draw, too. also, some new emdcc's seem to have a problem with the opening in the filler being too narrow (the position of the coils seems off), and i have to push the filler to the side a little before i can even get to the coil to push it aside (and keep doing that). i guess i figure that opening 10 of these in 6 weeks is enough, for now, so i'll try using the 7 i have cleaned and waiting to be cleaned before i open any more.
one thing i've found is that, since i chain vape in spurts, i'm better off having 2 of these going at once, so as not to heat the coils too much on any one of them. i tend to take very long inhales that really heat the carto up, and i'm not sure that's very good for me or the equipment. these are just my current observations. experiences seem to vary with each person, their vaping habits, and the juices they use. i'm still a happy camper with my emdcc's and plan to order more of them as soon as i can afford to.