You should generally check the 2-Sided option above the Wire option so the back side of an open Mesh object becomes visible. The newest addition to the Extended Parameters section (and a very welcome one at that) is Reflection Dimming. One of the biggest problems with Reflection mapping is that the maps do not respect light sources all that well.
If every tried to render a Chrome object in darkness or darker scenes, you know the problem. Essentially, the Reflection Mapped material appears to be somewhat illuminated. Reflection Dimming corrects this problem. As a rule of thumb, it is a good idea to turn Reflection Dimming on for just about every material using a Reflection map.
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