I keep hearing that renders in DAZ get better with IBL, specifically when using Uberenvironment. Before I spend any more money -- I went overboard with outfits before I realized I needed more tools -- I'd like to know exactly what the effect of Image Based Lighting is and how it differs from the lights that come with Daz.

The other pricey thing I keep hearing about is HSS. I don't have any idea how this works. I already have a pretty realistic skin that I'm using from Pureskins (that was worth it). If I use HSS, does it augment that skin or render it worthless? In other words, is the Human Surface Shader supposed to be used on existing skin, or does it provide new skin? I'm so confused.