Early on I had few problems with any of the devices and was quite happy with them.
However, as you purchase more and more of these products, the manufacturing defects are going to start popping up more and more. Chalk it up to the law of averages, I suppose.
I am still a very strong believer in this technology and I will not dispute the advantages and or deny the benefits I have experienced from dropping analogs in favor of these devices.
But I'm still dependent on the nicotine and when I can't get it, I get cranky. When someone says "Hey, this is new and improved and you'll get 8 hours of battery life and tons of smoke from this device and great flavor and throat hit, plus a 6 month warranty.", and all I get is a couple of hours, and I have to return parts every week then it gets a bit tiresome.
I'm glad that your experience so far has been positive. I hope that it continues for you because I wouldn't wish the frustration I've experienced of late on anyone.
I love the taste of the vapor. I love the idea of not smelling like an ashtray. My teeth are whiter. My lung function has improved. so far, 30%. I have more energy. I don't cough all the time. Perhaps it's because of these improvements that I so desperately want the technology to be up to par. I don't want to lose the ground that I have gained.
Hope this makes sense.
Vape on!
Edit: Oh...I was a 2 pack a day smoker for 36 years. I didn't take up the e-cig to quit. I took it up because I was tired of having to go outside in the heat and the cold to smoke. So imagine my amazement when I found that I preferred these to my old friend the analog that had been a part of my life for so long. (Just want to provide a little more perspective on my specific situation)