I'm having trouble finding why to upgrade from Xtreme 2.0 to 4...

I have DTP with live wrap (= "text repel"); through this I can save as PDF/x
I have two 3D applications that have more than extrusion
I have several photo editing applications for various needs/reasons
I have basic Web tools, and really don't develop for the Web in any case.

Ultimately, I want vector tools, and I can't see any difference here between 2.0 and 4. Can you help me out?

Thanks,
Dave