I've been running Saucony Kinvara for over a year now. My only complaint with them is that the cushioning only lasts about 250 miles. That makes it pretty expensive. The Cortana has the same 4mm heel-to-toe drop as the Kinvara, so I decided to test them out to see if they lasted longer. They have a more durable and slightly thicker sole so I hope that makes a difference. They cost 50% more than Kinvara, so if they don't last 50% longer, it's a bad investment. They are over an ounce heavier than