These would work out very nicely for you Opera Platea . They are on the smallish side for floorstanders and would work well with close to back wall placement. The sound would be somewhat fuller and warmer than your B&Ws. These work well with most music types. Yes, I own these in my main system.
I also have the Totem Mites in a room about your size. I auditioned them, along with the B&W 685, and went with the Mites. I just thought the Mites sounded better ... a bit cleaner, a bit warmer.
Rich