I tried the Affirm and DID NOT like them at all!!! I have the Ryka Rhythm II now, and just love them. If you're going to try Ryka, go with the Rhythm II.
There was absolutely no "bounce". I put them on and felt like I was walking on the floor. No cushion whatsoever. They hurt my feet; they hurt my ankles; they hurt my knees -- they just hurt, period. I couldn't even finish one workout with them because I thought I would injure my leg again (I pulled a muscle very very badly about a year ago in my calf -- took weeks of therapy to recover). The Affirm strained my calf muscles, so I became concerned about my leg.
I was told this was supposed to be one of Ryka's top sellers, and after trying it and comparing it to the Rhythm II, I can't see how Ryka can even sell the Affirm to ANYONE!