Did you listen to these speakers? There is a pair being advertised since long locally at 1/6 retail price and no takers.
I have heard the Estelon Extreme speakers when they were here in London a number of years ago. The hosts and the owner and his daughters who work in the company were incredibly gracious and passionate about their company, designs and speakers. i had a lot of respect for their entire presentation, and of course for the distributor, as well.
Incredibly well controlled within their limits and was impressed by how 'tight' everything seemed to be delivered even across a fairly demand range/scale of music. For me, where i wished it had 'more' was all-out effortless ability to give big dynamics/power/fill a room (compared with the big Wilsons, Focal Grandes let alone the Arrakis, Genesis 1s, etc). No, I did not compared side by side, but i turned up the music for less then 3-5 seconds in a decent sized room but not enormous...and the speaker strained. I have done this test on big Wilsons...and certainly on the Arrakis, it was absolutely seamless, composed...just louder and effortlessly so.
If the speaker has been updated since (does it have a 2nd generation cone now?)...perhaps this has been solved.
There is so much to like about this speaker, I would hope this bit is resolveable. At this size, scale and price...i want to feel like i could crank it and the speaker would be unflappable.