I received these today. To be brief, after a half hour I'm satisfied that these are one of the best medium sized speakers I've ever heard at any price, and may well be my lifetime speaker. They actually exceed my high expectations of them.
Of the ~250 pairs I've owned since 1968, these are second only to my Apogee Divas in my estimation, and then principally in soundstage scale. The Tempestas are actually more neutral.
These are a real triumph, and an outright steal at $4k. I will write up a full review when my enthusiasm settles down a bit.