Learned my lesson. I have been sticking to switching out my shoes at about 400 miles. Usually, by 400 miles they are blown and I start to feel the hot spots (soreness) in feet, legs, knees. Immediately after getting in new shoes the pains subside. Well, I pushed it with this last pair. I went well over 600 miles in them and the hot spots became bothersome. It was unwise to push it. My advice for this week… just get the new shoes. I usually have to get in new shoes every 2-3 months and have to accept it! Changing out shoes is better than causing long lasting damage!