I have VF but haven't done too much with it.  I got it cheap with purchasing Poser 6 and it was part of the reason I finally took the jump to P6.

I have fiddled in it but not tried to do anything with it "properly" as of yet.  The interface isn;t impressing me much so far but I have been happy with the ease of editing a clothing iem from the preloadable selection.

Basically I think it all depends on yoru expectations of it and how you intend to use the created items.