ren_mem, from what I've seen, e-on let you upgrade between versions for the difference in cost. Like if you got Esprit first, and then upgrade to Infinite, it basically costs you the difference between Esprit and Infinite. I find this to be quite fair. When C4Pro was released, all the guys that had purchased Transposer or Amapi basically lost their investment. Wouldn't call that fair... As far as I'm concerned, the only feature that would have convinced me to upgrade immediately would have been Subsurface Scattering. But it appears that C5 only offers absorbtion, and I was almost a victim of their clever marketing. I agree with you that Vue is probably due for another upgrade soon, as well as other apps. That's why I'll wait for the trial version of C5 before I take any decisions.