I was unfortunate enough to try a Caterpillar as my first RDA... that is NOT a tootle puffer atty!!! I wouldn't touch another RDA for over 6 months... then I started reading about the great flavor in the Magma, so I got one, and whaddyaknow, I actually like it. But it's a leaky lil thing... then I got a Veritas and a Derringer; the Veritas, not too bad, but I understand that one really needs to use a lot more power with it than I can tolerate, for it to be great; the Derringer is hopeless for a tootler; it's got "mystery airflow" from somewhere, even when every airhole is blocked.
Then I started reading about the Achilles, so I got one... and found my bliss. Another member here read how much I loved it, and PIFed me a 2nd one, *and* a Prometey. The Prometey is ok, sort of a "rebuildable carto," but I haven't tried it yet with the fiberfill, just as a dripper -- same tight airflow as the Achilles, but I love the Achilles' deep well -- the Achilles has actually weaned me off my Kayfun obsession.
Andria