I think it would look way better with just a normal mtb bar/stem combo. It looks like a really smart bike but then the eyes are drawn to whatever the hell that thing is bolted to the top of the steerer tube then it just gets ruined.
Really gorgeous bike, love the shape the stem and bars make from the side on view but I don't think I could live with the stem, I'm presuming it's a make do cos the frame is a little small and you need the height in it?