love the Origen…
as far as comparing to the Kayfun, its a different ball game.
The KF is a tank dripper and imo you get better flavor… I use Big Ben which I love better than any RDA tank… the juice feed is from the top to the coil.
The Origen is my favorite dual coil dripper… these are a different animal… the thing i love about it is there's better flavor from it than any dual coil dripper i've ever tried. For some reason duals, at low ohms while producing ridiculous clouds, most of them sort of lose in the flavor departmentl. ymmv but I've heard this from others too.
ANd it holds plenty of juice without flooding the coil… +1
Sometimes I want tons of vapor and the Origen gives it, plus good flavor too.. its like a fine cigar imo… lol.
I often mix flavors and just drip in the d/t when refilling… i like mixing flavors and tonight i tried filling each drip well with a different flavor … its cool lol.
*if you drip from the top, into the d/t, sometimes the juice wont always distribute evenly, and you will get some dry hits, and wonder "wth? i just dripped"… so its good to take the top cap off once in a while and fill that way.
then again, you can just drip from the d/t and really load it up to make sure no dry hits.