In my experience there isn't a significant difference in quality when I use the Poser shader tree. Some people like it though. You could do a few test renders on figures to see if you can tell the difference.

Of course, if your resoruces are falling low, it's probably not worth it. 

If you want a laugh, try posing a Poser figure inside Vue 6 Infinite. It would slow a super computer. 

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