I had Extremas at one point (they replaced Avalon Eclipse). I had a failure of the the bass driver on one of the speakers. Easy enough to replace and Sumiko was very responsive, however, it was incredulous to see that SF used plain old wood screws for driver mounting. The quality (or lack thereof) of the parts inside was also eye opening. I loved the cabinet but it seeemed there was so much more that could be done to improve that design.