I don't know about the synchrony ones but I auditioned the twos and they were great.
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Looking at the specs for both speakers, it's important to compare but of course listening to both is vital.
PSB Synchrony One B&W CDM 7NT
30hz to 20,000hz 40hz to 20,000hz
90 dB sensitivity 90dB sensitivity
4 ohms nominal impedance 8 ohms nominal impedance
full range speaker 2-1/2 way speaker
So the PSB will need more power to drive it because of its 4 ohm nominal impedance vs the B&W CDM 7NT at 8 ohms. The PSB will go lower in bass ext vs the B&W. THe PSB is a full range speaker vs the B&W being a 2-1/2 way. So as long as you have the extra power, the Synchrony One will be superior to the B&W CDM 7NT.
JA in the latest Stereophile said he could live happily with the Synchrony One during the review of the Magico V3 at many times the One's price. Here's the Stereophile review of the Synchrony One: http://stereophile.com/floorloudspeakers/408psb/