I also have Ultrasone Pro 750s, and I dont think they're all that.
They have too much low end (though you can tweak, sort of, with their placement on the head) the highs dont attack enough for all musics and they arent terribly accurate in the top end. Too lush.
They sound very, very, VERY nice, but I trust my HD25s more. I use the pro750s for mic placement (because they have great islolation and better soundstage), listening for fun (because they do sound great) and reference, but not for unflinching honesty required of monitors.
Oh, and the the "crazy patented technologies making giving them an amazing sound dispersion so they sound more like a set of speakers" is a plastic plate infront of the driver that has holes in the forward side so that, in theory, sound is directed against your pinnea, then into your ear, rather than straight into your ear. It only partly works to create a stereo field (rather than binaural) part of the time, and is clearly not flash tech (but is flash marketing). I believe this plate is what takes a lot of attack out of the sound as well.
And they need a shite-tonne of burn in too. HD25s dont need nearly as much.