I would hope that Vue 5 Pro has something signficant to add to programs.. One thing that is good about this side grade stuff. Is that I can have Vue 4 Pro on one machine and Vue 5 on another. This has advantage over being able to work on something while one is rendering something. Its also nice to have one up with scene used for reference while working on another. My main setup has has a 3.2Ghz and 2.6 P4's side by side... I also have a 2.8 and 2.26 at home for other things.. for Mojoworld - its great - for Vue and Lightwave - just render nodes. I will also likely be getting Vue 5 Pro. I really likely the lighting enhancments in Vue 5. The tutorials on e-on site are nice.. I still learning this stuff and have a long ways to go. My goal is one day build sci-fi scenes but I believe that will envolved a lot of Lightwave 3d modelling.. I using 8.01 which is the latest.