Metal, glass, mirrors you'll probably want to replace with native LuxRender materials. Glossy skins often turn out a bit too glossy, it would be good to have an option to mix in a bit of translucency and a bit of fuzziness. Most other materials already export quite well.

Software: OS X 10.8 - Poser Pro 2012 SR2 - Luxrender 1.0RC3 - Pose2Lux
Hardware: iMac - 3.06 GHz Core2Duo - 12 GB RAM - ATI Radeon HD 4670 - 256 MB