Have you ever looked at the default reflections and felt disgust? I have. It made me so upset I just had to do something about it. This mod is a softer and more detailed replacement for the environment maps.
There are several ways to change the reflections, such as an enb or one of those large graphical overhaul mods. However many users either don't want to use those mods or have computers unable to use those mods. This is a low impact performance friendly way to make things look a little nicer.