I read the hype regarding the Zig on the heel and thought these shoes would be worth a try.  Beware the upper sole of the shoe.  These shoes have a mesh upper sole that really doesn't do a very good job of keeping your foot down in the bottom of the shoe.  I only walked in them and I could feel a gap between the shoe and the heel of my foot.  There's no way I would bother to try running in them.  I suspect that the Zig really does help with cushion but the upper sole had better be a non-mesh type of material for these shoes to work.  I would pass on these shoes again in a heartbeat.