I went from ego twists to Smok Natural with RSST. I didnt want to fork out the cash for the provari and didnt want chinese made vv/vw pcb....Wrapping coils easier with mech mods because it will fire, especially if you arent so good at wrapping coils. I was frustrated with cartos and found that genesis atomizers arent hard to setup, and the taste and vapor trumps cartos (at least for me).
I still use my old twists for light and on the go situations. Parks, Amusement parks, sporting events, movie theaters, etc. You might want to consider keeping one back up.