The premise espoused on their webpage, to me, is a Bad Thing (tm). Designed to be intuitive to the layman but inherently flawed in logic.
They assert something to the effect of : "Guitars are made of wood and resonate, our speakers are made of wood, so they should resonate".
Ignoring something as basic as "production vs reproduction" (a well which they salt in their verbiage), and ignoring the metaphorical failings of "double resonating", I would point out that a trombone (which the speaker must also produce) is not made of wood.
*any* sound emission from a speaker, and this doesn't matter whether it's the cone or not, has to address the same issues of phase, coherence, and FR.
Their cabinet will not have a flat FR curve. I will also be out-of-phase. As such, a resonating cabinet will add improper sounds to the room.
(PS. Visually I like them. Perhaps someone can convince them to come to the GTG this weekend.)