I have been a long time runner, jogger, and have been into fitness for several years. I have been shoe shopping for the perfect running shoe for a while now, researching each shoe and the arch style, support, reviews, weight, and materials. I bought this shoe about a week ago, and have worked out and ran 3 miles in them out of the box, without a blister, ache, or pain. They fit perfectly for my feet. I would highly suggest going to a local store and trying them on before you buy them online, just a word of advice. I was looking at getting the 10.5M US but then put one on at the store, and I'm REALLY glad that I tried them on before buying them online, ordered the 10M instead. This shoe is SUPER LIGHT, you barely feel like they're on your feet. Like I said, you don't need to "break" these shoes in. they are so flexible and feel so invisible on your feet that I ran as if it were nothing the day I received them. I've never had Saucony's before, but I know now what my next running/training shoe will be! 5***** will definitely buy these shoes again.