I've got Scorpion Trails. 120/70-17 and 160/60-17. But, I've only had them since the end of August. I was sold on the idea of a dual compound tire. It is true, they give up absolutely nothing in the corners; that was my main concern. They look new with only about 1000 miles, as they should. I have a feeling that they won't last much past 5000 miles. I had a look at the Tourance Next, which looks similar. They say this dual compound tire will net you upwards to 10000 miles. But at what cost? I get tires fairly cheap here where I live, and I install and balance them myself. I also live in Canada (colder climate). So I lean more towards a softer, better handling tire than most others.
Not sure about it being a very good "dirt tire". I guess as long as it is dry you should be fine.
Hope this info helps a little.