I trained for my first 1/2 marathon and my usual running sneakers did not hold up to the mileage - bad blisters and achy knees.  I decided to invest in an expensive pair to see if the "hype" was real.  These were recommended highly so I took the plunge.  Agree with the reviewer about no blisters - same here (when not wearing cotton socks that is).  Have about 120 miles on them and they still feel brand new.  Worth every penny.  If you want to enjoy running, I recommend these.  It doesn't seem to say so here but when I purchased at a store, I was told that Brooks provides a run for 15 days return policy.