The Zus ended up with the former owner of the B&Ws. They were a lot of fun, and great transducers for $1000. But there's hardly a comparison. Tone is good and dynamics are lively, but they don't cast images so well and they're not quite as efficient as the company would have you think.
The Matrix 800s are just a different league of a thing. With 65 watts of tube power, they sound incredible at listening levels up to about 85 dB, but can lose some image focus if I get greedy for more volume.