It's a midrange-focused version of the Super Distortion model.
The treble and bass are lower than an SD, while the mids are boosted. It's a very thick, compressed sounding pickup.
Sounds great for both rhythm and lead IMO, not as loose as a Tone Zone or Super Distortion in the bass, and without the brightness of something like an Evolution.
Imagine a Breed Bridge model without the dual-resonance effect, 435mV and abour 25k resistance. It's HOT.