I wear Adizero Tempo, mainly for races/speedwork. What I like about them is that, while offering some support, they are streamlined and lightweight. From what I can tell, the 'Boosted' version is heavier and doesn't look as slick, which negates the whole point of the shoe. I tried out a Boost shoe once and didn't find them that comfy. So it's either a case of buying older Adizero Tempos or finding a new, comparable, shoe. Any suggestions welcome!