Correct, I was just curious if its the tank or non tank versions that appear to be affected. I have only been using smoktech tank cartos for about 2 months, so I do not have a very long period of time to compare to. However, in those two months, the only issues I have experienced are insta-burning cartos, and some goofy resistance changes (both way too high, and way too low). In terms of taste and performance change I have no base of comparison. I have experienced no chemical taste unless I am referring to the taste created by the insta-burnt scenario. On some cartos the draw does get stiff at times, but I have learned to correct this with a safety pin down the center of the hole. Based on some descriptions i have read in this thread, other folks are having a way worse experience with these than I am.
So far (rough math) I think I have personally seen about a 20%-25% failure rate. These failures have included:
1) Several "insta-burn" where the carto does not pop and fizz like usual and creates no vapor. Instead a nasty burn taste/smell is created. In this scenario the cartos usually meter out properly. It could theoretically be a matter of incorrect wicking, but I prep all the cartos pretty much identically (fill up filler with several drops, fill up tank and let it "bubble" for several minutes, followed by several hard dry pulls)
2) Incomplete milling on the thread of 1 unit
3) One carto shorting out after initially metering properly, this was not a matter of the inner post touching the threads.
4) One carto increased in resistance after a couple days, 1.7ohm to 4.5ohm
So far I think I have used about 25 or so of these cartomizers over the past couple months.