Mark Watson compares this process to MS' update, and calls it simple:
Why can't Microsoft make upgrades this easy. A few caveats: Ubuntu is not officially releasing "Breezy" until tomorrow, so I did this on my laptop (which is not my main Linux development system): In the Synaptic package manager, under Settings -> Repository, I manually edited my repositories changing all occurrences of "hoary" to "breezy" and I removed the install CDROM as a repository source. I then clicked the "Mark All Upgrades" taskbar icon and then clicked "Apply" - when asked, I chose the "Smart Mode" upgrade that apparently is meant for upgrading to new releases. One particularly great thing: under "hoary", I had to build and install my own driver for the RT2500 wifi device in my laptop and manually start it. After the upgrade, wireless is on with no manual operations. Note that with the RT2500, when booting Windows XP, I have to manually start wireless.
I don't know about you, but any process that involves manually editing configuration files and then building a driver isn't "easy", and doesn't compare favorably to Windows Update. or the Mac updater either.