seen a video on how to fill ego mega cartomizers on you tube by dbnaussievapor which makes some good review videos and was impressed. so i orded me a pack of 5 from litecigusa.net fast shipper too only 2 days. wow this is nice a lil hard to fill and seemed like it didnt work at first so i wiggled the hyperdermic needle around in the cart hole and wala clouds of vapor. i love the way it makes that gurgle and crackle sound as a real analog does adds to the realism of vaping. dont know how long a full cartomizer last, put 2ml of juice in it but its vaping good better than carts did for me. seems every drag so far feels like a full cart on its first few drags and like that its one unit less breaks in the sytem for air to enter to give you that ultralite feel i didnt like with lose carts. i like to hear if there are any problems and whats the life on these as they are disposable and how many times can you refill them?