Brian is right. I have only used ecigs for about 3-1/2 months now and I was very fortunate to find this forum to research "the good and the not so good" brands and such. I took the advice of long time vapers here and ordered a joye 510 kit. It came with 2 complete setups, charger and 5 cartridges for $35. The parts are pretty standard purchase for the 510 too.
Brian is right, cartridges aren't equal to a pack of cigarettes. You'll want to add liquid or change the cartridge after a few "drags". Plus, the liquid they prefill those cartridges with tastes pretty cruddy. The authentic look and feel seems to be what first time buyers look for in an ecig, but after using it for a day, that will go out the window. You'll want a long lasting battery, sturdy product, etc. over the look of it. They are all mostly too heavy to leave in your mouth like a cigarette too.
There's just so many false claims out there, you have to be careful. My sister and niece fell for an electronic cigarette scam a few months ago, called Prada. They keep sending new supplies and charging your account, like a contract club type thing.
Good luck and I highly recommend the advice of veteran vapers on this site.