I didn't know what to expect when I got the Saucony Freedom ISO 2 as I've always gone through the Saucony Guides. However, once I put them on I was amazed at how comfortable, light and flexible they are. I replaced the thin insole with an Aetrex insole and now I feel like I'm on cushions. I no longer have pain in my legs, knee problems and/or the same pain from nagging ankle injuries. I will definitely order another pair as a backup. I highly recommend giving them a try!