DL'd for my wife's EVO, and it works like magic, nearly doubling her battery life: x1.8 or better.
Decided to try it for my NS4G with not nearly the same result. The best i've seen, according the app itself, was x1.1. Useless!
Ok so it sounds like Juice Defender is not worth it anything on the Nexus-S ? But Green Power is the better battery saver ? The free version ok, or get the ultimate ?