Hello. been reading various posts here for a couple weeks after seeing some ads and getting to try an e cig at the tobacco store i decided to buy an M401 Dragon From Truesmoker its on the way now and am very happy with my decision. He was very helpful and nice was very pleased with my experience. I work nights and sent an email at like 1 am and he still responded within 5 mins. He did not have any spare atomizers though he said some were coming. was just wondering if all 401 parts are interchangeable. I like being prepared. was looking at back up atomizers m series from Vapor Barn.