Didn't sound like an acoustic guitar though - sounded somewhere between a nylon acoustic and a clean electric humbucker tone. I'm bearing in mind that the 'body' was a concrete slab, but still - not the best demo (imo). I'd rather see what the guitar can do with an average quality acoustic - it's implied that since it sounds passable with a concrete block, a proper acoustic guitar will sound much better (which it probably will), but why not do a demo with an acoustic in the first place ??? :?
Anyway, I had a listen to some Parker Fly piezo demos on youtube that sounded much better, fwiw.