Those are generally considered the best night sights, if not top 2. Those even look like the narrower front sight to give better sight picture. I almost bought those for my Glock, but then I bought a Sig that came with night sights. I was going to get the yellow over red, because red is at the end of the visible range and yellow is more in the middle. In my head, the yellow would be more “visible”. Most people buy the red.
The radioactive pixie dust in night sights longevity is measured in half life. That’s generally 10-12 years. So, in 10 to 12 years, it will be half as bright as it is now. If you are happy with the price, and get new(ish) sights, you have a 97% chance of loving them.