As a fan of the Saucony Kinvara and Vitarra, I found they were looking for a little more comfort for long-distance training without sacrificing light weight and near-zero toe-to-heel profile, not to mention increased durability. Having ridden my first pair (which I still wear regularly) over 300 miles, I purchased a second pair of the first version which I expect to wear for at least 300 miles. If you are looking for a reliable training or racing shoe that is light and fast, then this is the shoe for you.