I can't afford to just go out and buy everything. Every ball I have purchased since 2008 with the Cell Solid has been an arsenal purchase, replacing 16# with 15#.
I remember when the Black Widow came out. It struck me as Hammer's answer to the Vapor Zone, which I had.
I buy only partly on hype, but mostly on research. I bought the IQ Pearl right after it was released, like a bunch did at my center. When the Fusion came out, I did not consider that ball, as it did not fit my arsenal needs. Instead, I got a Supernatural, and the Sync, a ball that only a few have at my center, and none of them have any hand.