Newton makes very good shoes for someone looking to improve their running form by making you strike on the midfoot.  I've been running in them for about 3 weeks, and still feel soreness in my calves, but I can also feel those muscles strengthening, and I notice a change in my stride when I run in other shoes as well.  The shoes themselves don't make you faster, but they help you to become a better runner.  I have the Gravity and the Distance.  Ironically, the Gravity is designed for longer distances than the Distance (poor name choice IMO).  The Gravity is a little heavier and made of more cushioned, durable material than the Distance.  I like both.  I'll probably wear the Gravity in an upcoming marathon and use the Distance for track running and 5-10K runs.