These shoes seemed to be the answer to my prayers.  I log many miles a week inside and out.  I put this shoe on and there was no break-in time.  I just went.  The cushioning was superb.  The ventilation seemed to be a dream.  My feet did not hurt at all, my back and hips were happy.  I used the shoe on the elliptical as well as running outside.  I hadn't bought a Reebok product in 25 years because their products just never presented with current technology as well as styling.  THEN, after 5 weeks the mesh split over the joint of my left small toe.  Back they went.  My money was refunded with no questions.  I bought a second pair.  And after 4 weeks BOTH shoes split over the small toe joints.  Back they went.  Reebok has a new version of this shoe and I am very tempted.  It looks like the mesh may have been improved.  If you buy this shoe, do no use it for floor work such as squats and lunges.  The mesh cannot take the stress.