I've got a Dark Horse myself, and it does put out the good vapor, & flavor with my Double Tiger .45 ohm single coil build, the only complaint I have is the damn juice well is too small. I think it would be a first rate RDA if they made the juice well the same size, or just a wee bit deeper than the Vulcan has. That's the other RDA I use exclusively. Working with a Magma, trying to get accustomed to it, & eliminate the leak.
One solution I found was to take a rubber gasket like the ones with a Taifun, & slip it around the bottom of the deck in that little groove. That has helped it big time. I think it's a great RDA, & I'll keep using it, but the first one I would choose without hesitation for my all day vaping would be my beloved Vulcan.