My first impression is .. not a good one.
While the rendering time is really awsome and I love the interface and the general layout I am having a huge problem with hair.... all my hair is no longer working while it was working fine in Poser 7. All I get is the texture could not be loaded. Image map file could not be found or there is not enough memory to load it. I had the same problem with poser pro eventually it stopped but i ended up returning poser pro for a number of reasons.
So I checked everything a million times reinstalled some of the hair I was trying but I got way more ram then I need to run anything and everything.

So I like Poser 8 a lot... though unfortunately I will very likely end up returning it if I can not find a fix to the issue.