@ Fray = It's not odd, it is gravity fed just like the Phidias is.
I have found that it really feeds super just like the Phidias too, the thing about it is it delivers the perfect amount of liquid at the correct speed like the Phid does. I have also found that an Iken 2 ohm 510 is great with this Revo2 unit, puts out plumes of vapor plumes and has a very good flavor with this set up also. I gave mine to my Lady and she really likes it, it is a very simple user friendly Box Mod, I just wish I had waited and got the Revo2.1 with the 1400mAh Batt but this one is fine for her and she has gotten use to using it, it's very simple, plug and play type device, charge and go, squeeze bottle feed and vape, you can also squeeze the bottle at a horizontal position and feed and fire at the same time and it works like this as well, nice little Mods, Now that the Chinese ( Boge, and others to follow ) are starting to build Box mods I expect to see numerous ones coming out, wont be long before we see them in VV and all sorts of new tech I would imagine, Buzz may have some issues with his Paten trying to fight this one as they ad VV, should be fun to watch as this continues what comes out and what happens here in the vape world.