Hi mate, not sure which ones exactly you have. But I had a Freemax Fireluke Meshtank and had several packets of them in the singles, .15 ohm 40-90w and I personally found the quality of them to be appalling! They died early all the time, couple of days the flavour would drop off by like 70% and by day 4 to 5 dead. When I mentioned it here my use of sweetener was blamed. But using the same mixes these days with Naboo, Plex, Advken, I get on average 9 to 10 days. And I cant recall a dud amongst them, all very consistent in quality.