Pros: straps look good and are easy to install over my existing 4" fat tires.
Cons: Not very sturdy considering how much they cost. I used them on a single commute (total distance 26km) and already some of the studs are punching through the back of the strap. Commute consisted of ice, slush, hard pack and a few km of bare pavement.
Perhaps using a bit of a thicker base would prevent this.