Not even having a Spheroid ( but having been interested for a long time) that is the best analogy Ive seen so far. Logically the foam is holding the juice above and gravity is "dripping" juice onto your wick. I can see the only thing is finding that perfect balance of how much filler is needed in comparison to how viscous your juice is. Full VG less material, thin / high ratio PG more material. I had a Steam Machine which is very similar to the Spheroid in design and once I found that ratio it was great. I sold it because its shape was just too long, wand like and the finish on the atty , though beautiful , mirror shined, it got tarnished and no matter how much I wiped it, or even tried Cape Cod, it had juice and finger marks that never went away.
I hope someday to get a brushed Spheroid for my little 350 device. Im using Penelopes on it, like them but not " in love" like I am with my Odys.
The filler material is really great stuff. It was designed for aquariums and believe me if you have ever kept fish, that material is "safe" and rugged. Fish are extremely delicate, water is their life and if something is minusculy(?) toxic they will die.
I can see how you would not need to replace it, just rinse once in a while or have different pieces for different flavours.
Very good design, I can see how for those hard core drippers can have a happy alternative that can be pocket friendly and where one does not need to be a slave to dripping and dripping etc.
Not only gravity is dripping your juice on the wicks, but when you take a draw the juice gets pulled to your wicks. You can vape upside down, laying in bed, etc. It's like a leak proof dripper