I bought a new pair of the ride 4 and it has been disappointing.  the heel and outside edge of my whole shoe flattened out within the first weeks of having the shoe.  The 3 was a great shoe for long distances and for neutral and mild protonators. I am a neutral toe runner and the prior version lasted for 4 marathons and training miles still. The new version has an uncomfortable upper and seems to have a more solid midfoot than front or heel.