Shame it doesn't work very well
The upgrade is all very well, only the new network manager is basically undocumented, and crashes precisely every second invocation for me, which means I can't use it; the new kernel won't suspend and resume on my laptop; and the new configurationless X.org has some serious problems, not least of which that the keyboard and mouse configuration preference applets no longer work (again, at least for me) so that I can't set the keyboard auto-repeat rates or mouse acceleration, without first restoring my X.org configuration file, and adding a magic "please don't autoconfigure" commmand.
So in sum, I had to reinstall the Hardy kernel, I can't use the new network manager, and I can't use X.org without configuration, which adds up to oh well, at least I get fixes to lots of bugs that I filed over the last six months.
I had already been recommending non-technical users I know to stick with Hardy, as it works well, and is sufficiently up-to-date for most general use purposes. This only makes me wonder if I should have taken my own advice.