Thorsten,
I heard these at a heathrow show a few years ago and enjoyed some things that they did very much.
I particularly liked the out-of-cabinet experience of them.
Despite being a horn lover, I found the horn tweeter to be a bit harsh and overbearing - although the room may have been a factor in that of course.
Have you made any adjustments, and did you think the treble a little overbearing in the show?
cheers
chris