I have barely owned these shoes, but like some other reviewers I find they feel stiff. The rubber used just doesn't feel as natural as other Sauconys I've had. The heel does hit changing the muscles being used some. The person who introduced me to Saucony said to pick the shoe that feels like you're not wearing a shoe. i.e. that doesn't alter your walk or stride in the least bit.

The heel hitting is to me the biggest downside. The other thing is the rubber feels cheap/stiff. Hopefully breaking in will loosen them up.

Regardless, it fits well and is a good shoe.