I simply love the ease of use with Indigo...
- double clicking on a material to access the indigo specific settings
- change of the materials appearance within SketchUp when importing
- preview render for materials
- use of (even textured) materials as lightsource
- support of face me components
these are some features that make Indigo such a wonderfully simple, but mighty tool.
is there any (free?) biased renderer with the same fast workflow that gives you as much control as Indigo does? would be very interesting - from time to time waiting 10 hours or longer for an image to clear up is a bit unnerving