I just upgraded to 5, and I haven't had much time to use it yet. But I wanted to caution anyone who is thinking of upgrading to get a screen capture of the upgrade cost. It seems that my cost as shown on the web page was a little bit too low. (about 5%). I ordered the upgrade, and didn't notice the difference in price until I got the confirmation email. When I called customer service, they could not get their calculator to display the price I had seen, so I am out of luck (they did issue me a credit toward future purchases). They said if I had taken a screen capture, they would have honored it. Lesson learned.