the lighting options and rendering in C6 is far worth the price to me
i still pose stuff in poser, and work on some basic material designs that carrara doesn't have the control for, just rendering them as a lone background, then use it as a texture map, works nice
but i doubt i'll render accual scenes in it anymore, just pose stuff, dynamic hair/cloth, export to C6, add the lights and materials, C6 has fire and water primitive :) and render