They are a little noisy on the road but they are very solid in the dirt. Okay in shallow mud but sand can be a challenge. As far as dual sport tires go all tires are a compromise. There are better tires for the street or the trail, but this tire is tough for me to beat for its ability to do both. I'm about 70% street 30% dirt and trails, and this tires gets me there. It's also extremely inexpensive.
I use these tires on pretty much all my on-/ff road bikes.The tire handles excellent on pavement. Sticks to the the rocks and hard packed dirt like a trials tire. Does just fine in just about everything. Only in deep sand and i assume in a deep mud it is noticeable worse than real knobby. The tire life is okay.
I run this tire on a RS 520 Beta 90 % dirt.. Well mostly rock in the N Idaho mountains... On high speed gravel roads and forest service roads these things are great... Tread life suffers a little from the Beta power but for the $$ and performance I'm willing to deal with it... On my 3rd set.
These tires might be fine on a big bike with tubeless wheels, but my experience with them on a KLR has been terrible. They offer no confidence on any terrain besides pavement. They are as bad on gravel as they are in the mud. On dry dirt they are manageable, but still not that good.
I consider tires a cheap investment. If a good set of tires can save you from crashing, then its money well spent. These tires may cause you crash, I suggest if you have a bike with tube type rims you pick something else.