Well, I finally got the serial number, installed it, opened one of the sample files, hit render, and watched the interface vanish as it immediately crashed. Didn't give me a great deal of confidence. It also says in the docs with the installer that the Poser Fusion plug-in is supposed to support Poser Pro, but it refused to accept Poser Pro 2010 as a valid version of Poser, which didn't inspire me with any more confidence than I already didn't have to begin with. Other than that the ten minutes of so I played around with it were OK, renderer seemed fairly quick.
Back to leaving it installed and never using it again