Kerkythea works amazingly well! The 2007 version has been fully updated with easier to use controls and functions. Its renderings are eye poppingly good! I took MoI for a spin last night and rendered it in Kerkythea, its very impressive to say the least. And making a sphere in MoI is much easier than trying to make one in SketchUp.

You can watch the Kerkythea demo real here:
http://www.youtube.com/watch?v=14vYeC9GaAU

Cheers!