I have had the Reference 207/2s for about three years now. I had a chance to hear the Blades recently and here are my impressions: First of all, I was impressed at how impressed I was with their sound. Very well integrated from top to bottom, wonderful timing and musicality with wide open and smooth mids and highs. The bass was tight and certainly not lacking. And this was with them being driven by a Raysonic CD player and a TEAC integrated amp! Coming home to my system, the key difference that I hear is the smoothness in the mids to highs and the integration of the sound over the frequency spectrum, the Blades were really smooth. I think my set up images better, but they had a set of horn speakers sitting next to the Blades for a demo later that day and I think that interfered with the sound. Also, I have much better electronics so I'm sure that makes a big difference as well, I can only imagine how they would sound in my system.
Hope that helps.
Bryston BDP-1 > ARC DAC 8 > ARC Ref 40 Pre > Bryston 28B Power > Cardas Clear > KEF Reference 207/2s. Shunyata Power and Cardas Clear ICs throughout.