Yeah, as many have said here, no such thing exists. As far as my most trouble free topper? The Iclear 30s with caveat. I am only vaping light juices in them, and they last a long time with a good, strong consistent vape. So much so in fact, that I haven't seen the need to try to clean the heads; I just buy new ones. I do keep dark and sweet juices in my PT2's, which I re-build. The PT2's are also good, but quite a bit more fussy.