Actually, the highs are pretty natural sounding. The extension is actually there, but it sounds so pure it can sound too tame or dull for some. The whole speaker just sounds like a piece (or displaying a seamless sound), if that makes any sense. Really, really transparent and no cabinet colorations, etc.
If you have a chance, try to hear them. If I could fit them into my small NYC listening room, I'd buy em outright. Alas, I have to be happy with my minimonitors, which still fill me with joy, so I am fine.
Michael