I wanted to chime in on this thread as I have started to use the 1.7 smoktech tank cartos with an eGo-T. So far I have liked these cartos but I have also noticed all the inconsistencies noted in this thread. As a backstory, I started with the DCT tanks using dual coil 1.5s but got tired of poor battery life on eGo-T 650 and I wanted a little bit warmer vape. I ordered 10 single coil cartos from MadVapes (6x 2.0 ohm, 4, 1.7ohm) My experiences are as follows:
1) Draw does seem inconsistent between cartos, some what I would consider "perfect", some that are a little stiffer
2) One had incomplete thread milling
3) One I burnt up instantly, I still do not know what I did because I use the same procedure for initial filling every time
4) I do get the "drop" of liquid that forms on the battery connector, no big deal I just wipe it up with a qtip a couple times a day
5) Some gurgling can happen, this is usually when too much liquid leaks and accumulates on the battery connector (see #4). I typically give it a good shake to get out the excess
6) Sometimes when draw gets stiff, I stick a safety pin down the middle and spin the carto around to clear the air passage
7) I get about a week out of each carto (I have two different flavors in rotation at any given time, menthol and coffee) and I go through a little less than a tank a day on each.
8) All mine came in a clear wrapper
I disassembled the first couple I used just to see what the wear and tear on these units are after a week. As expected the coffee unit was pretty burnt (as the taste reflected) and the menthol less so (but the taste still got harsh). I am not going to even bother cleaning them based on this observation, cleaning doesnt fix that burnt buildup. I have started to notice that when I get the dark liquid going back into the tank, its time to toss it.
Overall I am liking this carto, even with all the inconsistencies. I just ordered 32 more of the 1.7 ohms as I felt they just performed better than the 2.0 ohm versions. At $1.79 a pop I can't complain all that much, however it would be nice for them to be a little more consistent.