Yeah I'm not sure I used both a Joye Ego and a cheap imitation one both were good. I think stick with the basic well known brand Joye Ego if you want 510 thread or try Echo if you want KR808 thread (I think that's right) I would try reading the Ego reviews or Echo reviews maybe watch some utube reviews to help make up your mind. I also recommend you use cartomizers unread of 3 piece system of atomizers and tanks/cartridges
