Yes, Pose2Lux doesn't make any new materials other than what Luxrender itself can use. What Pose2Lux does differently is that you can write your own materials based on Luxrenders shaders and set them up in an xml file to use in the Pose2Lux exporter. If you write them, you have control over the amounts of reflection, gloss, translucency, etc. Only a few of us write our own mats: it's not something you learn overnight...lol. It's easy enough to set a material up in xml, but you have to understand Luxrender material parameters first. The materials included with the exporter work fine with most things, so if you substitute your Poser material for one of the materials in the exporter things should look nice when you render in Luxrender :). Pose2Lux doesn't do as much for you as Reality does, but in the end there is probably more control over the output than what Reality has. You just have to do more of the work yourself ;).

Laurie