So, I put a set of 705's on a few days ago. 130/80 in the front. I raised the front fender 35mm with a crappy custom bracket - doing only 35mm allowed me to keep the stock brake line (crossover section). When I get a chance, I'll put on stainless brake lines and raise the fender another 35mm.
But, for the tires themselves...
I've put on about 300 miles so far, about 70 or so on dirt roads. Some fast hard dirt (50 mph stuff), some loose gravel but nothing too tricky. The 705 really did well out there, as well it should. After they were scrubbed in a bit, they felt pretty good on pavement, too. There's a bit more road noise, of course, but nothing I'd consider bad. They do turn in a little harder than the front Distancia I took off. It could be due to the geometry change associated with the slightly taller tire (causing more trail and rake - right??) or tire profile, or both. Whatever the cause, it doesn't bother me a nit - just need to be aware of it.
Now, we'll see how they wear. I'll post back when they need replacing (if I remember).
Oh, and I talked to a fellow Versys rider who's be using tube-type tires on his V without tubes. No problems. (mine are tubeless, just adding this because I and others were curious about this point...)