Normally I use the kanger OCC square could at .5ohms and they work great! I change the coils when they start to get that burn taste and before it sizzles your theist on a hit you weren't expecting! The OCC last a week tops sometimes I change 4-7 days depending on how much I'm vaping so I was really excited to get these subex Clapton coils hoping I would get better flavor for longer than the OCC I was used to using and unfortunately, no dice. The flavor isn't as rich to begin with and I find myself changing coils every 3-4 days now. I would not personally buy these ones again! I have 3 boxes left and I'd sell them back if I could! Note also that I do know how to build my own and get the best flavor that way however for the convenience factor for driving to work and then being at work I prefer to use these prebuilts rather than build myself. All in all I have to give a 3 though because the packaging, the cool itself, and the unparalleled customer service these guys at ecigempire provide is worth more than anything.
Don't know if I rec bad pack firing at 30 on pill d2 and also tried my smok m-80 and same thing burnt taste need to lower to 11-12 to fire and not burn