I have to say it smells a bit like snake oil to me - but I'm not yet 100% sure. Yes, guitar pups do pickup some of the acoustic too (more or less depending on the pups), but that's air pressure, not wood's (or any other material) vibration. Not to say this shouldn't have any impact on the resulting tone, but this doesn't necessarily mean it will "amplifies the wood’s natural resonant frequencies, energizes the tone of your guitar and optimizes the sonic range of your pickup" (which is where I stopped reading, too much marketing bullsh!t in a single sentence as far as I'm concerned).
tl;dr: I'll wait until someone I really trust try and approve it, then I'll possibly try it by myself - except I don't have any guitar with direct mount :lol: