I did listen to them and ummm, they were okay.
In all seriousness, taking the price out of the picture, it was the best sounding Ultrasone that I heard at their table (auditioned around five different pairs). The biggest take-away from this model was that it was ultra-smooth compared to their other offerings, which all tended to be a bit peaky and bright. The resolution was great, detail was stellar, and nothing struck me as a major weakness.
Now, taking the price into consideration. To me it did not sound significantly better than the majority of ~$1,500 - $2,000 headphones on the market currently, but with more time and in-depth comparison, I would say it would hold its weight in this general league and would come down to personal tastes in the end. However, it seemed like the exact same housing as all the other high-end models they offer, at much better prices I might add, which is both comfy and light, but generally feels a bit flimsy. I believe the salesman told me that the cups are made out of something rare and expensive and that they have some additional expensive highlights (such as with the markers to tell you how to put them on, etc.). Then they come with that fancy case and a nice twisted silver cable... those two items alone must be worth at least three grand right!
All in all, I see this as a headphone for those who not only want to have the best, but want to flaunt it too. Sort of like the Vmoda crazy Crossfade badges made out of diamonds, gold, and precious stones. For 99% of headphone fanatics out there, your money would be better spent elsewhere, which I hope is obvious. Let that super rich guy, who nobody likes because they push their wealth into peoples' faces any chance they get, be the one to pick them up and you be the one to turn your back and laugh at the whole idea when it happens.
However, it was cool to try out such an expensive pair though and the Ultrasone guys were both very friendly and informative... I actually felt a little weird for a moment while I was handling them; found myself looking for the nearest exit, just in case someone bumped me and I snapped them in two on the table or something!
Edit: I actually don't remember the model name unfortunately... additional edit, informed by
@Hansotek that they are called the Jubilee 25 and that 250 were made.