They aren't worth $1000, I think. I have a design for a mini-onken horn and they're not that difficult to make if you have the right tools. But look like nice speakers none the less especially if finished.
I guess they are worth what folks are willing to pay for them. I wouldn't pay $1000 for them either. But some non-DIYers may b ewilling to do so.
I was more interested in this person's descriptions of the sound, than the speakers themselves, hence my pointng it out. I have never heard the onken design myself. -akhilesh