The "special" is in the carved top and dual piezo placement - one is in the bridge saddle, of course, but the other is in the "sweet spot" in the "belly" of the arch to capture the top vibration. Feels and sounds special to me, at least, though YMMV, of course.I assume you could get 1/4 scale Helicores on any bass that was string through, or had a long bridge like that. Maybe I'm wrong, but it doesn't look like there is very much special about that setup.