Trust me,I was in absolute amazement at the "complete" level of performance from the Extremas(I don't own a Sonus product,but can easily be honest,here).It did both subtle detail,gorgeous timbres and really amazing dynamics aplenty!It is DEFINITELY in need of powerful,super clean amps though.I thought it was superior to any Sonus product I have heard(just opinion),though I have not heard the Strad!
As to looks,it sort of reminded me of a BIG Kharma Exquisite Minimonitor,on a stand,only in solid(gorgeous)wood.The "indented lines" running down the top to front reminded me(in a good way)of that comparison.
As from what I can surmise,these were discontinued("what MORONS")because they were too tough a load to drive,as so many Euro hobbyists like to run low power amps.
I believe if introduced now,with the realization of better solid state,and tube designs,they would be a viable product.
I envy the "LUCKY" few who have,or can get a "MINT" pair.
Wife acceptance factor should be really high on these "masterpieces"!
I have been at this hobby for over 35 years and few designs "scream" heirloom quality,as these do.Sometimes a really great design doesn't need to be replaced,just because some review /marketing plan decides to push another design(good or not).Some products really stand the test of time.Just ask the "classic car" collector,or "classic watch" collector.
Best of luck!!