Right again, Bruno, about the XFrog plant libraries containing vob's, sorry to be misinforming, haven't really checked this, never planned to buy any of the libraries :)

About whether XFrog (3.5, I've never tried 4) is easy or not, and people starting to build their own models: I have seen very few original XFrog models in the Vue gallery renders ( I only occasionally browse the others)  maybe because very few own the program, or maybe they own it and can't figure out how to use it. If you (bruno021) find it easy to use, I think your one of the few. I have done a fair amount of modeling with XFrog and still find the different variables confusing and non-intuitive (and I'm not "lesser gifted").
In Onyxtree I feel I can spend my time being creative and focus on the outcome instead a lot of trial-and-error tweaking with obscure parameters.
Just my personal opinion, certainly nothing wrong with XFrog as such.

• I don't want this to be an ongoing debate for or against XFrog or Onyxtree, so don't expect too much in that direction. Both programs have their pros and cons.