I have gone through several Echelon 3 pairs, so I figured why not I'll try the Echelon 4.  I should have read some reviews online first before purchasing these online.  They run a little narrower than the Echelon 3's, and I find they are comfortable enough while running, but during regular use or walking, they are too tight and make the sides of my foot ache.  Hopefully they will continue to break in.  Please keep this in mind though if you have slightly wider feet and are between Regular/Wide sizing.