With an arthritic knee nearing 70 years of age, I am fussy about my shoes. The K-Swiss Defier and Ultraschendor have served me well. For tennis, they are my favorite.  When my knee starts hurting, I know it is time to get a new pair, which I do 2 or three times per year, even though they still look good.  Different folks find different shoes to be a good fit, so perhaps there are those who will not find them to be as comfortable and supportive as I do, but I am very satisfied.