so i've used dual coils for awhile on and off and recently decided to try the mega dual coils from madvapes, hold about 3.5ml of liquid, and these things are great, i use them on a new e-power and used one since i got them 7 days ago and it still works awesome, and i've been using liquid that normally burns threw my carto's in about 2 or 3 days. i decided to clean it and switch to a new one and just use that one once i go threw my other 4, it was starting to taste slightly burnt but after cleaning it looks brand new (it's clear) so my guess is it was just the juice build up on the bottom, posting this just to let people know how long lasting these things are incase anyone had any doubts. i wanted to try the ego dual coils but not sure how it would look cuz i'd need an extention on the e-power