Well, took the moustache bars off the Lemond, but only because I needed it for other stuff. 

However, the moustache bars have migrated to my Bridgestone mb-5 mountainbike and combined with slick 1.5 street tires it is riding awsome. 

Plus it looks wierd; half the people I passed today were probably wondering "what is that?  A mountainbike?  A roadbike?"  Questions first asked of the bridgestone x0-1, which I attempted to copy, based around an mb-5 frame.

Even with only a 46t outer chainrign it cruised at 17-20 mph going through the great swmap, a local flat route, but when I took a shortcut on a dirt path through the woods it worked fine (until I reached where the pathw as overgrown -- doh!)

Putting a 52t chainring (to appraximate xo-1 gearing) would mean I'd have to lose the innermost "granny" gear as the derailieur isn't long enough to run that too without the chain rubbing, but then the gearing 52-34 should work okay, it works for most road compasts and this thing has even smaller rims than those (26" vs. 700c") so I shouldn't be over geared.  I never actually used the granny gear, onroad or off, so far. 

Offroad or onroad, the moustache bars on a mountainbike do indeed give a unique position.  Only change I would make is to eliminate the slight "drop" in height and have the bars be completely flat.