Vapor 3's don't fit the foot in the same way as the vapor speeds, nor the vapor S2's (the '04 model). The S2 was the lightest and, hence, more maneuverable; not so hot on the durability. The Vapor Speed's look great and fit nicely, but also are lacking in the durability department. I think the Vapor Speeds have the best cushioning (at least for my flat feet). The Vapor 3's feel a little wider, and don't seem to cushion as well as the Vapor Speed's do. I wish they would bring back the Vapor Speed's, or the S2's for that matter.