Long time User. I can tell you this debate, and upset ness comes up with every major release from Parallels. I just filled out a survey after purchasing PD7 just because I did not want to deal with incompatibility but its easier that way. I disagree with their upgrade strategy especially since vmware is always touting discounts to switch and the full price is the upgrade price of parallels. They would have a faster rate of upgrade over at parallels if they did not charge so much for an upgrade.