I use an ego with a vivi nova, works great. I want to pick something up for my dad because he wants to try one, of course he wants it closest to a cigarette feel/look so 510 it is. I like the vivi nova because theres not much messing around you have to do. Fill it with liquid and thats it. Hes going to want the same. I remember using cartridges with a 510 in the beginning and it was a pain, constantly filling them with liquid, putting new poly in them ect. So what are some of the "go to" types for a 510 for a hassle free good vaping experience?