Well, I upgraded from pfSense 1.2.3 to the latest snapshot. It was very easy and all is working great. I love the new psSense!
I accessed my existing pfSense gui and upgraded to the latest snapshot. It was painless and fast. Everything seemed to work perfectly.
What can I say, I like fresh installs, because it makes me feel good and I know that there aren't any misc or ill configured files hanging around that might mess things up. So I exported the config.xml file to my computer, performed a fresh install of the latest pfSense snapshot, and then uploaded the config.xml saved earlier. All is great and easy!
Looking at the config files of 1.2.3 and the 2.0 snapshot, I can see the differences.
All I can say is… NO PROBLEMS! Yeah!