I bought the yellow top because where I run, there is a serious lack of lights if you run when the sun goes down, and I needed something bright to make sure people in their cars see me, having had a few close shaves before! This top seriously delivers - it's very fluorescent and bright so does the job needed. I have only worn it a few times and thus far, no fading but I can imagine with more wear the colour/brightness could fade. However for the price it is very worth it and will not break the bank to just buy another one!
It is lightweight and breathable, and dries relatively quickly.
I will be buying the white one very soon