Upgrade went as expected. The computer asked me a few questions and then took about 40 minutes or so of chugging away. I frankly could not tell if the performance was any better and everything pretty much looked the same to me. I did get back about 7 gb of disk space which I suppose is ok. Despite rumours to contrary, Office works just fine as far as I can tell.
The upgrade did kill my installation of MySQL database server and Django--both of which are required for some work I'm doing with further automation of the things I do to run the Scottish Oil Club. I guess this was caused when the upgrade over-wrote the symbolic links in /usr/local and included an upgrade to Python 2.6. Following easy instructions at the links below got MySQL and Django back in operation.