I went with a Cartomizer when I bought my mini for cost reasons. I bought a pack 5 and out of the 5 pack only 2 worked. I am on my last Cart right now, hoping I don't get the burt taste till I can get more in. My question is what is better? And most of all more cost effective? How much do I need to buy or start out with a month. Any help would be greatly appreciated. Thank you.