Hi people - am currenlty riding around the world on an NX650 myself.
Now being Australian, dirt riding is something I favour, and is indeed my preference.
I have tried it out on what is supposed to be some of the worst roads in Sth America (not too sure how true this is) but the Dommie is fine, no problems, and whats best is that it handles great on tar too - not super moto style, but all lugguaged up its great. And back home in Australia, for trial runs I took the dommie fully laden, two up, through some really tight trial bike runs (the home of WRs and CRFs) and really fanged it, and the handling was fine. And sand dunes are no dramas, tried them too!
I think the XR650L is a great bike, but tends to be more expensive. And I think that it is far more uncomfortable and more gutless - and if you arent a dirt fanatic, I reckon the Dommies right up to the job. And if you dont like the plastic - which it is pretty bad - it takes literally 10 minutes to remove it all. And with an acerbis tank, you wouldnt know it was a dommie at all. And to change the front is a half days job at most...
The best adventage for the dommie is the frame, it is easier to create crash bars, pannier racks, etc. I am one who says it is a hardier frame, not one you would use on a dirt bike.
And my dommie pretty much goes where I point it (and some parts makes my hair stand on end).
Should have some photos on the web site soon...check it out
www.loston.com