i use the brand V2cigs
i never tried any other brand so i can't compare. they are ok i guess. i would rate them 3 to 4 stars out of five. i've had some problems with quality issues in the past. they were minor things but when you have all the parts working, it's great.
and remember, everyone is different. all the smokers i know who have tried the ecig hate it. they've either tasted it and didn't care for it or tried it out and went back to real cigs. i'm just glad i was able to stick to it.
also, if you are/were a smoker like me, who was just into the regular brands like marlborough and not the more expensive cigs like benson & hedges, ecigs are more expensive but not by a whole lot. for me, it was worth it
here's to give you an idea. i smoke like one e-cartridge a day, which costs $2 for a cartridge. I used to finish a pack of cigarettes every 3-4 days, I'm not a heavy smoker. so in 3-4 days, that's about 4 cartridges which would cost me $8. a pack of marlborough would cost $5-$6. see, not a whole lot different. the only costly thing is you gotta invest some money in the beginning to start (i'd say roughly $50-$100 depending on the brand of ecig you go with that comes with the battery(s), car charger and all that)