I would have to disagree. I've been an e-cig user for a while and I've used quite a few different brands. Hands down the best one I've found has been Green Smoke.
While other brands might be cheaper, they're also much harder to use. Manually refilling the cartridge was no fun. I got
e-liquid everywhere when I was refilling, and it was messy. I had to throw out a $75 shirt because I dropped the
e-liquid bottle on it and stained the entire thing. Very frustrating.
The 2-piece design is much easier to use and GS's cartomizers last the longest of all the e-cig brands the I've tried.
I've also had problems with Green Smoke products, ones that almost made me stop using them. But I've found their customer service to be incredibly helpful. They'll bend over backwards to help. Give them a call, they do their best to please.
DON'T listen to anyone telling you to use a
mod. Just last week it was all over the news that someone was using a mod in Florida and the battery blew up in his face. It knocked out his front teeth and burned away half his tongue.
Good luck!