I've owned two pair of this model since early April of this year, only about four months.  I only wear them to do a 3.8 mile walk around my neighborhood, about 3-4 times a week, at about 3.5 mph, a brisk walk.  That's about 230-250 miles, total.  All four shoes are already developing holes in the material that contacts the back of each ankle.  These shoes replaced two pair of Model 847 (not V2) that did the same thing.  Also the laces are made of a slick material that frequently comes undone, maybe once in five or six walks.  Other than those two things, the shoes are okay.  They are lightweight, comfortable, and well ventilated.