I got really good mileage on my rear super explorer, about 8.8k and it had maybe 500-1000 left before the cords but it was handling like shit at that point on the road so I replaced it.
You will loose some cornering ability on the street. I've had my rear end slip on hairpins with the mefo, so keep that in mind. I'd say it's better than the heidenau off-road, but the heidenau is better on-road.
If money was less of an issue I'd just run TKC-80's which give great grip on and off road but they only last 2000-3000 miles on the rear.
"All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost."
'12 690 Enduro
// 690 Wiki