If you don't want to deal with rebuildables, then I've personally found the Aspire Nautilus tanks to be a close 2nd. They flavor isn't quite as good as something like a Kayfun 4 but it's pretty close and pop out old atty, screw in new one, oh wow that took 15 seconds, tends to beat, dismantle Kayfun 4, hmmm, no, wait, I can't, yet another O-ring is stuck on it [let's pause for 20 minutes while I figure out how to dismantle the thing], oh ok, great, building a coil is easy, so is cotton, so is everything really, but hey, that's 8 different things to do, unscrew it, get top off chimney, pull out old coil and wick, install new one, test it, on darn a short because one of the wires is touching that ring around it, fix that, no problem, oh hey, it works! awesome, let's put it back together again, hey, this vapes great! [25 minutes have passed].
It depends a lot on how much you vape, but the Nautilus tanks are really, really easy to work with, and give you about 90% of the positive benefits of something like a RTDA.