This is without a doubt the best ecig I have used. I initially got this from puresmoker after being pretty disapointed with 3 DSE901B "mini". I have used this product for a two months now. I currently have 18 atomizers and all of them still work, 4 of them seem to have diminished but they are all draining now, I experienced dimished vapor quality after about 1 to 3 weeks with these and then I let them drain out for a week standing by themselves and they revive themself back to as good as new quality, 10 of my atomizers are from heavens gifts (ruyandirect.com) and the other 8 are from puresmoker. The batteries are not that great, they last about 4 or 5 hours with good quality vapor if I am vaping on it consistently. I prefer to use USB passthru battery anyway which I use most of the time. I have not had an analog since I received this product as a 1-3 pack a day smoker for 15 years (since I was 12 years old).