I liked the fact that the Wave Inspire 8 is wider than the 7, but the entire fit was different.  I loved the 7 because of the support it gave me, especially in the heel.  However, I found the shoe to be too narrow.  The Wave Inspire 8 seemed wider and I thought it would be a better fit for me, but I was wrong.  They fit differently in the heel area and gave me heel pain when I wore them.  It felt as if the heel is more recessed in the 8.  These shoes just do not work for me, so they had to go back.