while i havent tried the bulli line i do own a pheonix style and the
vape quality really depends on your build. a cheaper model and a highend model will only
vape as well as you make it designed for. as far as build quality that is something that is more important. poor build quality will require slight modifications to get to work up to par. not to mention the higher risk of leaking. my main thing i look out for is the one's with a air hole on the threads as those will be more prone to leaks.